audio_sender: mute state must be kept when restarting medias

When settuping the AudioSender, the audio can be started with
muteState_ = true. This avoid the case where the peer needs to
renegotiate the medias (like changing their camera resolution,
stopping a stream, etc) the audio will be restarted forgetting
the mute state.

Change-Id: Ic33e297809a72f4c7f85c1cdd354f99d953618cc
GitLab: #327

src/media/audio/audio_sender.cpp

@@ -93,6 +93,7 @@ AudioSender::setup(SocketPair& socketPair)
     auto codec = std::static_pointer_cast<AccountAudioCodecInfo>(args_.codec);
     audioInput_ = jami::getAudioInput(id_);
     audioInput_->setFormat(codec->audioformat);
+    audioInput_->setMuted(muteState_);
     audioInput_->attach(this);
     return true;
 }