Remove unused notification component

extensions/sticky/js/forum/src/components/DiscussionStickiedNotification.js

@@ -1,17 +0,0 @@
-import Notification from 'flarum/components/Notification';
-
-export default class DiscussionStickiedNotification extends Notification {
-  icon() {
-    return 'thumb-tack';
-  }
-
-  href() {
-    const notification = this.props.notification;
-
-    return app.route.discussion(notification.subject(), notification.content().postNumber);
-  }
-
-  content() {
-    return '{username} stickied';
-  }
-}