obs-ffmpeg: Remove unbuffered mode from media source

Unbuffered mode is causing the frames of media sources to potentially
have some slight jitter in playback, so instead of using unbuffered mode
with media sources, just leave buffering on.  There may be a frame or so
of latency, but it shouldn't be noticeable to most users.

plugins/obs-ffmpeg/obs-ffmpeg-source.c

@@ -318,16 +318,12 @@ static void ffmpeg_source_update(void *data, obs_data_t *settings)
 		s->is_looping = obs_data_get_bool(settings, "looping");
 		s->close_when_inactive =
 			obs_data_get_bool(settings, "close_when_inactive");
-
-		obs_source_set_async_unbuffered(s->source, true);
 	} else {
 		input = (char *)obs_data_get_string(settings, "input");
 		input_format =
 			(char *)obs_data_get_string(settings, "input_format");
 		s->is_looping = false;
 		s->close_when_inactive = true;
-
-		obs_source_set_async_unbuffered(s->source, false);
 	}
 
 	s->input = input ? bstrdup(input) : NULL;