efl: simplify logic for widget created by factory.

efl: simplify logic for widget created by factory.

In an attempt to make things more complex than they should have been,
I tried to change the inheritance tree on the fly and assume widget would
rely on autodeleting its children. This is way more complex of a solution
than to let the View actually release all the child manually and just set
the window as the default parent.h

Co-authored-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D9953