fix(web): correctly register notification service worker

Author: jagandeepbrar

web/index.html

@@ -60,6 +60,8 @@
     if ('serviceWorker' in navigator) {
       // Service workers are supported. Use them.
       window.addEventListener('load', function () {
+        navigator.serviceWorker.register('/firebase-messaging-sw.js');
+
         // Wait for registration to finish before dropping the <script> tag.
         // Otherwise, the browser will load the script multiple times,
         // potentially different versions.