evas_object_grid: Fix memory leak.

_evas_object_smart_clipped_init() (in evas_object_smart.c) is called when evas_object_grid is created.
And a rectangle is created in the function.

But, the rectangle is not deleted even  though evas_objecct_grid is deleted.
This patch fixes the problem by deleting it in smart_del fucntion.

Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D11140

src/lib/evas/canvas/evas_object_grid.c

@@ -187,6 +187,8 @@ _evas_object_grid_smart_del(Evas_Object *o)
 	free(opt);
 	l = eina_list_remove_list(l, l);
      }
+
+   _evas_object_grid_parent_sc->del(o);
 }
 
 static void