[bugfix] DropdownMenu: incorrect style when inside NavBar (#4098)

src/dropdown-item/index.js

@@ -82,6 +82,7 @@ export default createComponent({
           key={option.value}
           icon={option.icon}
           title={option.text}
+          class={bem('option')}
           style={{ color: active ? activeColor : '' }}
           onClick={() => {
             this.showPopup = false;

src/dropdown-item/index.less

@@ -6,6 +6,10 @@
   left: 0;
   overflow: hidden;
 
+  &__option {
+    text-align: left;
+  }
+
   &--up {
     top: 0;
   }