Efl.Canvas.Group: use desired function

Efl.Canvas.Group: use desired function

Summary:
If a smart class overrides Evas_Smart_Class.move as below,
then original behavior must not be used for the smart class.

   Evas_Smart_Class sc = EVAS_SMART_CLASS_INIT_NAME_VERSION("MyClass");
   evas_object_smart_clipped_smart_set(&sc);
   sc.move = &myMove;

But current implementation makes original behavior work.
So before using the original method, this patch is checking if the original
method is changed or not.

Reviewers: zmike, devilhorns

Reviewed By: zmike

Subscribers: woohyun, jypark, cedric, raster, jpeg, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6468