fix: picker 组件允许 click 事件冒泡

src/platforms/app-plus/view/components/picker/index.vue

 <template>
   <uni-picker
-    @click.stop="_show"
+    @click="_show"
     v-on="$listeners"
   >
     <slot />

src/platforms/h5/view/components/picker/index.vue

 <template>
   <uni-picker
     :disabled="disabled"
-    @click.stop="_show"
+    @click="_show"
     v-on="$listeners"
   >
     <div