Fix missed usage of self.localMedia?.audioTracks[0]
Fix missed usage of self.localMedia?.audioTracks[0]

ptankTwilio/video-quickstart-swift,ptankTwilio/video-quickstart-swift,paynerc/video-quickstart-swift,ceaglest/video-quickstart-swift,paynerc/video-quickstart-swift,twilio/video-quickstart-swift,ceaglest/video-quickstart-swift,twilio/video-quickstart-swift