The main div isn't hidden anymore on XS screens

And since a long time

public/js/vroom.js

@@ -865,9 +865,6 @@ function initVroom(room) {
         el.addClass('selected');
         mainVid = el.attr('id');
         // Cut the volume the corresponding preview
-        // but only on screen > 768
-        // On smaller screens, the main video is hidden
-        if ($(window).width() > 768){
         $('#webRTCVideo video').each(function(){
           if ($(this).get(0).paused){
             $(this).get(0).play();
@@ -878,9 +875,9 @@ function initVroom(room) {
           $('#mainVideo video').get(0).volume = 1;
         }
         else {
+          // If we put our own video in the main div, we need to mute it
           $('#mainVideo video').get(0).volume = 0;
         }
-        }
         $('#mainVideo').show(200);
       }
     }, wait);