accept javascript confirm dialog on admin delete label link

spec/features/admin/admin_labels_spec.rb

@@ -33,7 +33,7 @@ RSpec.describe 'admin issues labels' do
     it 'deletes all labels', :js do
       page.within '.labels' do
         page.all('.btn-remove').each do |remove|
-          remove.click
+          accept_confirm { remove.click }
           wait_for_requests
         end
       end