libobs: Fix item copying during scene duplication

When item in the old scene had only Scale Filter, texture renderer
was not created for an item in the new scene. However if the item also
had Crop set, the texture renderer was created.

Now after copying the data, texture renderer is created for the item in
the new scene when needed.

Closes jp9000/obs-studio#969

libobs/obs-scene.c

@@ -1121,6 +1121,14 @@ obs_scene_t *obs_scene_duplicate(obs_scene_t *scene, const char *name,
 
 			obs_sceneitem_set_crop(new_item, &item->crop);
 
+			if (!new_item->item_render &&
+			    item_texture_enabled(new_item)) {
+				obs_enter_graphics();
+				new_item->item_render = gs_texrender_create(
+						GS_RGBA, GS_ZS_NONE);
+				obs_leave_graphics();
+			}
+
 			obs_source_release(source);
 		}
 	}