fix race condition when loading labels in filter bar

spec/features/issues/filtered_search/dropdown_label_spec.rb

@@ -68,7 +68,7 @@ describe 'Dropdown label', :js do
     it 'shows loading indicator when opened and hides it when loaded' do
       filtered_search.set('label:')
 
-      expect(find(js_dropdown_label)).to have_css('.filter-dropdown-loading')
+      expect(page).to have_css("#{js_dropdown_label} .filter-dropdown-loading", visible: true)
       expect(find(js_dropdown_label)).not_to have_css('.filter-dropdown-loading')
     end