Remove unnecessary 'load' on notif audio element

It's not necessary to explicitly load and it throws an exception
if you call it while the element is playing, so better to just
remove it.

src/Notifier.js

@@ -96,7 +96,6 @@ const Notifier = {
     _playAudioNotification: function(ev, room) {
         const e = document.getElementById("messageAudio");
         if (e) {
-            e.load();
             e.play();
         }
     },