fix: 解决 Chrome 自动填充时 placeholder 仍然可见的问题

src/core/view/components/input/index.vue

 <template>
-  <uni-input
-    @change.stop
-    v-on="$listeners"
+  <uni-input
+    @change.stop
+    v-on="$listeners"
   >
-    <div
-      ref="wrapper"
-      class="uni-input-wrapper"
+    <div
+      ref="wrapper"
+      class="uni-input-wrapper"
     >
       <div
         v-show="!(composing || valueSync.length)"
@@ -299,6 +299,7 @@ uni-input[hidden] {
 }
 
 .uni-input-input {
+  position: relative;
   display: block;
   height: 100%;
   background: none;