Table: delete duplicate declaration "ElTooltip", fixed #4046 (#4047)

packages/table/src/table-body.js

@@ -3,7 +3,6 @@ import { hasClass } from 'element-ui/src/utils/dom';
 import ElCheckbox from 'element-ui/packages/checkbox';
 import ElTooltip from 'element-ui/packages/tooltip';
 import debounce from 'throttle-debounce/debounce';
-import ElTooltip from 'element-ui/packages/tooltip';
 
 export default {
   components: {