efl_ui_check: make it undependend of nstate
check can only display 2 states, and is only designed to do so.
Additionally, nstate inherits from button, which
brings in autorepeat, which is hileriously broken on check and cannot
Right now there is not even support in the theme for clickable. So its a
good idea to get rid of this for now IMO.
Reviewers: stefan_schmidt, zmike, segfaultxavi, akanad, YOhoho
Reviewed By: zmike
Differential Revision: https://phab.enlightenment.org/D9018