Edge: remove workaround that required track cloning
Edge: remove workaround that required track cloning

removes a workaround that required cloning the track in addStream
which made muting via .enabled very hard.

Acidburn0zzz/adapter,webrtc/adapter,xdumaine/adapter,xdumaine/adapter,Acidburn0zzz/adapter,jan-ivar/adapter,Acidburn0zzz/adapter,webrtc/adapter,jan-ivar/adapter