Js linting done.

Closes #3240553

js/announcements_feed.announcement.es6.js

 (function (Drupal, once) {
-
   /**
    * Update the announce icon when tray is opened.
    *
@@ -7,13 +6,16 @@
    */
   Drupal.behaviors.announce = {
     attach(context) {
-      const announcement = once('announce-new', '.announce-new', context).shift();
+      const announcement = once(
+        'announce-new',
+        '.announce-new',
+        context,
+      ).shift();
       if (announcement) {
         announcement.addEventListener('click', function (e) {
           e.currentTarget.classList.remove('announce-new');
-        })
+        });
       }
-    }
+    },
   };
-
-})( Drupal, once);
+})(Drupal, once);