Removing govuk js

app/assets/javascripts/errorBanner.js

@@ -1,6 +1,8 @@
 (function (window) {
   "use strict";
 
+  window.NotifyModules = window.NotifyModules || {};
+
   /*
   This module is intended to be used to show and hide an error banner based on a javascript trigger. You should make
   sure the banner has an appropriate aria-live attribute, and a tabindex of -1 so that screenreaders and keyboard users
@@ -8,7 +10,7 @@
 
   This may behave in unexpected ways if you have more than one element with the `banner-dangerous` class on your page.
   */
-  window.GOVUK.ErrorBanner = {
+  window.NotifyModules.ErrorBanner = {
     hideBanner: () => $('.banner-dangerous').addClass('display-none'),
     showBanner: () => $('.banner-dangerous')
       .removeClass('display-none')