Autocomplete: update style (#13762)

fix regression introduced in pr #13266, where popper arrow is hidden

packages/theme-chalk/src/autocomplete.scss

@@ -15,14 +15,13 @@
   box-shadow: $--box-shadow-light;
   border-radius: $--border-radius-base;
   border: 1px solid $--border-color-light;
-  overflow: hidden;
   box-sizing: border-box;
+  background-color: $--color-white;
 
   @include e(wrap) {
     max-height: 280px;
     padding: 10px 0;
     box-sizing: border-box;
-    background-color: $--color-white;
   }
 
   @include e(list) {