fix(service-worker): fixes service worker issue in init-service-worke… (#3378)

platform/viewer/public/init-service-worker.js

@@ -3,7 +3,12 @@
 // modules, so it's perfectly fine to serve this code to any browsers
 // (older browsers will just ignore it)
 //
-import { Workbox } from 'https://storage.googleapis.com/workbox-cdn/releases/5.0.0-beta.1/workbox-window.prod.mjs';
+//import { Workbox } from './workbox-window.prod.mjs';
+// proper initialization
+if( 'function' === typeof importScripts) {
+  importScripts(
+    'https://storage.googleapis.com/workbox-cdn/releases/6.5.4/workbox-window.prod.mjs'
+  );
 
   var supportsServiceWorker = 'serviceWorker' in navigator;
   var isNotLocalDevelopment =
@@ -50,3 +55,5 @@ if (supportsServiceWorker && isNotLocalDevelopment) {
 
     wb.register();
   }
+
+}