Resolve #3478046 "Fix eslint pipeline"

Closes #3478046

js/webform.admin.dropbutton.js

@@ -4,9 +4,6 @@
  */
 
 (function ($, Drupal, once) {
-
-  'use strict';
-
   // Make sure that dropButton behavior exists.
   if (!Drupal.behaviors.dropButton) {
     return;
@@ -15,12 +12,17 @@
   /**
    * Wrap Drupal's dropbutton behavior so that the dropbutton widget is only visible after it is initialized.
    */
-  var dropButton = Drupal.behaviors.dropButton;
+  const dropButton = Drupal.behaviors.dropButton;
   Drupal.behaviors.dropButton = {
-    attach: function (context, settings) {
+    attach(context, settings) {
       dropButton.attach(context, settings);
-      $(once('webform-dropbutton', '.webform-dropbutton .dropbutton-wrapper', context)).css('visibility', 'visible');
-    }
+      $(
+        once(
+          'webform-dropbutton',
+          '.webform-dropbutton .dropbutton-wrapper',
+          context,
+        ),
+      ).css('visibility', 'visible');
+    },
   };
-
 })(jQuery, Drupal, once);