obs-ffmpeg: Remove unnecessary open call

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

@@ -299,8 +299,6 @@ static void ffmpeg_source_update(void *data, obs_data_t *settings)
 		s->media_valid = false;
 	}
 
-	ffmpeg_source_open(s);
-
 	dump_source_info(s, input, input_format);
 	if (!s->restart_on_activate || obs_source_active(s->source))
 		ffmpeg_source_start(s);