style(Picker): update action button color (#6214)

* style(Picker): update action button color

* test: update snapshot

src/picker/test/__snapshots__/demo.spec.js.snap

@@ -4,65 +4,7 @@ exports[`renders demo correctly 1`] = `
 <div>
   <div>
     <div class="van-picker">
-      <!---->
-      <div class="van-picker__columns" style="height: 220px;">
-        <div class="van-picker-column">
-          <ul class="van-picker-column__wrapper" style="transform: translate3d(0, 88px, 0); transition-duration: 0ms; transition-property: none;">
-            <li role="button" tabindex="0" class="van-picker-column__item van-picker-column__item--selected" style="height: 44px;">
-              <div class="van-ellipsis">杭州</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">宁波</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">温州</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">嘉兴</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">湖州</div>
-            </li>
-          </ul>
-        </div>
-        <div class="van-picker__mask" style="background-size: 100% 88px;"></div>
-        <div class="van-hairline-unset--top-bottom van-picker__frame" style="height: 44px;"></div>
-      </div>
-      <!---->
-    </div>
-  </div>
-  <div>
-    <div class="van-picker">
-      <!---->
-      <div class="van-picker__columns" style="height: 220px;">
-        <div class="van-picker-column">
-          <ul class="van-picker-column__wrapper" style="transform: translate3d(0, 0px, 0); transition-duration: 0ms; transition-property: none;">
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">杭州</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">宁波</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item van-picker-column__item--selected" style="height: 44px;">
-              <div class="van-ellipsis">温州</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">嘉兴</div>
-            </li>
-            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
-              <div class="van-ellipsis">湖州</div>
-            </li>
-          </ul>
-        </div>
-        <div class="van-picker__mask" style="background-size: 100% 88px;"></div>
-        <div class="van-hairline-unset--top-bottom van-picker__frame" style="height: 44px;"></div>
-      </div>
-      <!---->
-    </div>
-  </div>
-  <div>
-    <div class="van-picker">
-      <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
         <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
       </div>
       <!---->
@@ -94,7 +36,39 @@ exports[`renders demo correctly 1`] = `
   </div>
   <div>
     <div class="van-picker">
-      <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+        <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
+      </div>
+      <!---->
+      <div class="van-picker__columns" style="height: 220px;">
+        <div class="van-picker-column">
+          <ul class="van-picker-column__wrapper" style="transform: translate3d(0, 0px, 0); transition-duration: 0ms; transition-property: none;">
+            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
+              <div class="van-ellipsis">杭州</div>
+            </li>
+            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
+              <div class="van-ellipsis">宁波</div>
+            </li>
+            <li role="button" tabindex="0" class="van-picker-column__item van-picker-column__item--selected" style="height: 44px;">
+              <div class="van-ellipsis">温州</div>
+            </li>
+            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
+              <div class="van-ellipsis">嘉兴</div>
+            </li>
+            <li role="button" tabindex="0" class="van-picker-column__item" style="height: 44px;">
+              <div class="van-ellipsis">湖州</div>
+            </li>
+          </ul>
+        </div>
+        <div class="van-picker__mask" style="background-size: 100% 88px;"></div>
+        <div class="van-hairline-unset--top-bottom van-picker__frame" style="height: 44px;"></div>
+      </div>
+      <!---->
+    </div>
+  </div>
+  <div>
+    <div class="van-picker">
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
         <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
       </div>
       <!---->
@@ -139,7 +113,7 @@ exports[`renders demo correctly 1`] = `
   </div>
   <div>
     <div class="van-picker">
-      <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
         <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
       </div>
       <!---->
@@ -182,6 +156,9 @@ exports[`renders demo correctly 1`] = `
   </div>
   <div>
     <div class="van-picker">
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+        <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
+      </div>
       <!---->
       <div class="van-picker__columns" style="height: 220px;">
         <div class="van-picker-column">
@@ -205,6 +182,9 @@ exports[`renders demo correctly 1`] = `
   </div>
   <div>
     <div class="van-picker">
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+        <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
+      </div>
       <!---->
       <div class="van-picker__columns" style="height: 220px;">
         <div class="van-picker-column column1">
@@ -244,6 +224,9 @@ exports[`renders demo correctly 1`] = `
   </div>
   <div>
     <div class="van-picker">
+      <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>
+        <div class="van-ellipsis van-picker__title">标题</div><button type="button" class="van-picker__confirm">确认</button>
+      </div>
       <div class="van-loading van-loading--circular van-picker__loading"><span class="van-loading__spinner van-loading__spinner--circular"><svg viewBox="25 25 50 50" class="van-loading__circular"><circle cx="50" cy="50" r="20" fill="none"></circle></svg></span></div>
       <div class="van-picker__columns" style="height: 220px;">
         <div class="van-picker-column column1">

src/picker/test/__snapshots__/index.spec.js.snap

@@ -58,7 +58,7 @@ exports[`column watch default index 2`] = `
 
 exports[`columns-top、columns-bottom prop 1`] = `
 <div class="van-picker">
-  <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button><button type="button" class="van-picker__confirm">确认</button></div>
+  <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button><button type="button" class="van-picker__confirm">确认</button></div>
   <!---->Custom Columns Top<div class="van-picker__columns" style="height: 220px;">
     <div class="van-picker-column">
       <ul class="van-picker-column__wrapper" style="transform: translate3d(0, 88px, 0); transition-duration: 0ms; transition-property: none;"></ul>
@@ -90,7 +90,7 @@ exports[`not allow html 1`] = `
 
 exports[`render title slot 1`] = `
 <div class="van-picker">
-  <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>Custom title<button type="button" class="van-picker__confirm">确认</button></div>
+  <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button>Custom title<button type="button" class="van-picker__confirm">确认</button></div>
   <!---->
   <div class="van-picker__columns" style="height: 220px;">
     <div class="van-picker-column">
@@ -114,6 +114,6 @@ exports[`toolbar-position prop 1`] = `
     <div class="van-picker__mask" style="background-size: 100% 88px;"></div>
     <div class="van-hairline-unset--top-bottom van-picker__frame" style="height: 44px;"></div>
   </div>
-  <div class="van-hairline--top-bottom van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button><button type="button" class="van-picker__confirm">确认</button></div>
+  <div class="van-picker__toolbar"><button type="button" class="van-picker__cancel">取消</button><button type="button" class="van-picker__confirm">确认</button></div>
 </div>
 `;