Fix for AudioContext not existing in Safari

app/src/RoomClient.js

@@ -999,6 +999,7 @@ export default class RoomClient
 		logger.debug('resumeAudio()');
 		try
 		{
+			if (AudioContext)
 				await this._audioContext.resume();
 
 			store.dispatch(
@@ -1508,6 +1509,8 @@ export default class RoomClient
 				}
 			});
 
+			if (AudioContext)
+			{
 				this._audioContext = new AudioContext();
 
 				// We need to provoke user interaction to get permission from browser to start audio
@@ -1516,6 +1519,7 @@ export default class RoomClient
 					store.dispatch(stateActions.setAudioSuspended({ audioSuspended: true }));
 				}
 			}
+		}
 		catch (error)
 		{
 			logger.error('_setMicProducer() failed:%o', error);