chore: Removes duplicate script from index.html (#24)

* Removes duplicate script from index.html

* Update index.html

* Update index.html

Author: cgutierr-zgz

__brick__/web/index.html

@@ -48,10 +48,6 @@
   <div id="progress-bar" style="border: 1px solid blue; width: 250px; height: 50px;">
     <div id="progress-indicator" style="background-color: blue; height: 100%; width: 0%;"></div>
   </div>
-  <script>
-    // The value below is injected by flutter build, do not touch.
-    var serviceWorkerVersion = null;
-  </script>
   <script>
     (function() {
       const progressBar = document.querySelector('#progress-bar');