test(Sku): fix failed demo snapshot

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

@@ -34,5 +34,13 @@ exports[`renders demo correctly 1`] = `
       </span></div>
       </button></div>
   </div>
+  <div>
+    <div class="sku-container">
+      <!----> <button class="van-button van-button--primary van-button--normal van-button--block">
+        <div class="van-button__content"><span class="van-button__text">
+        sku大图模式
+      </span></div>
+      </button></div>
+  </div>
 </div>
 `;