efl_ui_widget: move focus_highlight to the window

efl_ui_widget: move focus_highlight to the window

summary_:
the widget implementation just redirected calls from efl_ui_widget to
efl_ui_win. Which makes the properties unncessesary on the widget. This
commit moves them now to the window.

The legacy implementation of the window can now go away, as this is
taken care of by eolian directly.

ref T7553

Depends on D8017

Reviewers: woohyun

Reviewed By: woohyun

Subscribers: segfaultxavi, cedric, #reviewers, #committers

Tags: #efl

Maniphest Tasks: T7553

Reviewed-by: WooHyun Jung <woohyun0705@gmail.com>
Differential Revision: https://phab.enlightenment.org/D8025