Table: register scrollbar in filter-panel (#16246)

packages/table/src/filter-panel.vue

@@ -50,6 +50,7 @@
   import Dropdown from './dropdown';
   import ElCheckbox from 'element-ui/packages/checkbox';
   import ElCheckboxGroup from 'element-ui/packages/checkbox-group';
+  import ElScrollbar from 'element-ui/packages/scrollbar';
 
   export default {
     name: 'ElTableFilterPanel',
@@ -62,7 +63,8 @@
 
     components: {
       ElCheckbox,
-      ElCheckboxGroup
+      ElCheckboxGroup,
+      ElScrollbar
     },
 
     props: {