Attempt to switch bubble sound playing into Phaser

In iOS, we cannot trigger a playing sound if it does not start from a user gesture.
This is a huge bummer for a notification sound!

This is an attempt to switch sound playing to Phaser, which is using under the hood the WebAudio API.
This might solve the issue.

front/src/WebRtc/SimplePeer.ts

@@ -246,7 +246,6 @@ export class SimplePeer {
      * This is triggered twice. Once by the server, and once by a remote client disconnecting
      */
     private closeConnection(userId : number) {
-        mediaManager.playWebrtcOutSound();
         try {
             const peer = this.PeerConnectionArray.get(userId);
             if (peer === undefined) {