fix(pwa): replace js comments - "//" to "/* */"

js comments were invalidating following lines after html compression

Author: Pablo Vieira

_includes/ios-fullscreen.html

@@ -1,8 +1,8 @@
 <script type="text/javascript">
 $(document).ready(function(){
-  // PWA: iOS web full screen seamless experience
+  /* PWA: iOS web full screen seamless experience */
   if(window.navigator.standalone == true) {
-    // all links remain in web app mode
+    /* all links remain in web app mode */
     $('a').click(function() {
       window.location = $(this).attr('href');
       return false;