Use the first audio output device by default

It is the OS default audio output in Chrome.

app/src/RoomClient.js

@@ -2750,7 +2750,18 @@ export default class RoomClient
 					this.enableWebcam();
 			}
 			
-			this._updateAudioOutputDevices();
+			await this._updateAudioOutputDevices();
+
+			const { selectedAudioOutputDevice } = store.getState().settings;
+
+			if (!selectedAudioOutputDevice && this._audioOutputDevices !== {})
+			{
+				store.dispatch(
+					settingsActions.setSelectedAudioOutputDevice(
+						Object.keys(this._audioOutputDevices)[0]
+					)
+				);
+			}
 		
 			store.dispatch(roomActions.setRoomState('connected'));