update droplab

app/assets/javascripts/filtered_search/dropdown_hint.js

-require('./filtered_search_dropdown');
+import droplabFilter from '../droplab/plugins/filter';
 
-/* global droplabFilter */
+require('./filtered_search_dropdown');
 
 (() => {
   class DropdownHint extends gl.FilteredSearchDropdown {

app/assets/javascripts/filtered_search/dropdown_non_user.js

-require('./filtered_search_dropdown');
+import droplabAjax from '../droplab/plugins/ajax';
+import droplabFilter from '../droplab/plugins/filter';
 
-/* global droplabAjax */
-/* global droplabFilter */
+require('./filtered_search_dropdown');
 
 (() => {
   class DropdownNonUser extends gl.FilteredSearchDropdown {

app/assets/javascripts/filtered_search/dropdown_user.js

-require('./filtered_search_dropdown');
+import droplabAjaxFilter from '../droplab/plugins/ajax_filter';
 
-/* global droplabAjaxFilter */
+require('./filtered_search_dropdown');
 
 (() => {
   class DropdownUser extends gl.FilteredSearchDropdown {

app/assets/javascripts/filtered_search/filtered_search_dropdown_manager.js

-/* global DropLab */
+import DropLab from '../droplab/droplab';
 import FilteredSearchContainer from './container';
 
 (() => {

app/assets/javascripts/main.js

@@ -75,12 +75,6 @@ import './u2f/error';
 import './u2f/register';
 import './u2f/util';
 
-// droplab
-import './droplab/droplab';
-import './droplab/plugins/ajax';
-import './droplab/plugins/ajax_filter';
-import './droplab/plugins/filter';
-
 // everything else
 import './abuse_reports';
 import './activities';