libobs: Fix scene filter duplication

Scene filters were not being copied when a scene was duplicated with
obs_scene_duplicate.

Closes jp9000/obs-studio#1104

libobs/obs-scene.c

@@ -1095,6 +1095,8 @@ obs_scene_t *obs_scene_duplicate(obs_scene_t *scene, const char *name,
 	new_scene = make_private ?
 		obs_scene_create_private(name) : obs_scene_create(name);
 
+	obs_source_copy_filters(new_scene->source, scene->source);
+
 	obs_data_apply(new_scene->source->private_settings,
 			scene->source->private_settings);
 

libobs/obs-source.c

@@ -452,7 +452,6 @@ obs_source_t *obs_source_duplicate(obs_source_t *source,
 				create_private ? OBS_SCENE_DUP_PRIVATE_COPY :
 					OBS_SCENE_DUP_COPY);
 		obs_source_t *new_source = obs_scene_get_source(new_scene);
-		duplicate_filters(new_source, source, create_private);
 		return new_source;
 	}