Revert "libobs: Avoid request graphics lock after full_lock(scene)."

This reverts commit 66c27c2ceaa653dbfde7629cc65d36bcb7e1e9c2.

libobs/obs-scene.c

@@ -1867,7 +1867,9 @@ static obs_sceneitem_t *obs_scene_add_internal(obs_scene_t *scene,
 	}
 
 	if (item_texture_enabled(item)) {
+		obs_enter_graphics();
 		item->item_render = gs_texrender_create(GS_RGBA, GS_ZS_NONE);
+		obs_leave_graphics();
 	}
 
 	full_lock(scene);