libobs: Fix Monitoring devices showing input devices

This bug fix is to show output devices in the Advanced Audio
Settings configuration, where currently on macOS it shows erroneously
input devices.

libobs/audio-monitoring/osx/coreaudio-enum-devices.c

@@ -32,7 +32,7 @@ static bool obs_enum_audio_monitoring_device(obs_enum_audio_device_cb cb,
 	/* check to see if it's a mac input device */
 	if (!allow_inputs) {
 		AudioObjectGetPropertyDataSize(id, &addr, 0, NULL, &size);
-		if (!size)
+		if (size)
 			return true;
 	}