Fixed ESLint error (#15214)

* eslint --fix

* fix consistent-return

* fix promise/catch-or-return

* ignore import rule

app/javascript/mastodon/actions/notifications.js

@@ -257,7 +257,7 @@ export function setupBrowserNotifications() {
     if ('Notification' in window && 'permissions' in navigator) {
       navigator.permissions.query({ name: 'notifications' }).then((status) => {
         status.onchange = () => dispatch(setBrowserPermission(Notification.permission));
-      });
+      }).catch(console.warn);
     }
   };
 }