Display join audio window if back from breakout room.

bigbluebutton-client/src/org/bigbluebutton/core/model/Me.as

...nt/src/org/bigbluebutton/main/model/users/BreakoutRoom.as

...g/bigbluebutton/modules/users/services/MessageReceiver.as

...luebutton/modules/users/views/JoinBreakoutRoomWindow.mxml