fix(auto-complete): cannot use configProvider prefixCls #4566 (#4568)

Co-authored-by: candychuang <[email protected]>

close #4566

Author: candy-Tong

components/auto-complete/index.jsx

@@ -43,7 +43,7 @@ const AutoComplete = {
   name: 'AAutoComplete',
   props: {
     ...AutoCompleteProps,
-    prefixCls: PropTypes.string.def('ant-select'),
+    prefixCls: PropTypes.string,
     showSearch: PropTypes.bool.def(false),
     transitionName: PropTypes.string.def('slide-up'),
     choiceTransitionName: PropTypes.string.def('zoom'),