No need to tag depsgraph id when dropping objects from the outliner

As done by c42fc19a8a - this was needed originally because notifiers were
not working so I had to force tagging.

And for the records, I should have used DEG_TAG_BASE_FLAGS_UPDATE instead of 0.

source/blender/editors/object/object_add.c

@@ -2483,9 +2483,6 @@ static int add_named_exec(bContext *C, wmOperator *op)
 	/* TODO(sergey): Only update relations for the current scene. */
 	DEG_relations_tag_update(bmain);
 
-	/* TODO(sergey): Use proper flag for tagging here. */
-	DEG_id_tag_update(&scene->id, 0);
-
 	WM_event_add_notifier(C, NC_SCENE | ND_OB_SELECT, scene);
 	WM_event_add_notifier(C, NC_SCENE | ND_OB_ACTIVE, scene);