fix(components): [select] gurad value type error (#14074)

fix(components): [useSelect.ts] selected.slice is not a function

select In the case of radio, the packaged code will report select. slice is not a function, because the radio selected is an object, and the object does not have the api of slice

packages/components/select/src/useSelect.ts

@@ -914,11 +914,11 @@ export const useSelect = (props, states: States, ctx) => {
   )
 
   const showTagList = computed(() =>
-    states.selected.slice(0, props.maxCollapseTags)
+    props.multiple ? states.selected.slice(0, props.maxCollapseTags) : []
   )
 
   const collapseTagList = computed(() =>
-    states.selected.slice(props.maxCollapseTags)
+    props.multiple ? states.selected.slice(props.maxCollapseTags) : []
   )
 
   const navigateOptions = (direction) => {