unmute method
Unmute
Implementation
void unmute([bool audio = true, bool video = true]) {
  logger.debug('unmute()');
  bool audioUnMuted = false, videoUnMuted = false;
  if (_audioMuted == true && audio) {
    audioUnMuted = true;
    _audioMuted = false;
    if (_localHold == false) {
      _toggleMuteAudio(false);
    }
  }
  if (_videoMuted == true && video) {
    videoUnMuted = true;
    _videoMuted = false;
    if (_localHold == false) {
      _toggleMuteVideo(false);
    }
  }
  if (audioUnMuted == true || videoUnMuted == true) {
    _onunmute(audioUnMuted, videoUnMuted);
  }
}