kcm: Port auto-revert overlay's buttons to footer item
It's been in my branch since forever, so anyways…
Tab and focus management doesn't really work for Kirigami overlay sheets, event with Qt.callLater hack. In particular, Escape always gets handled by kcmshell which causes it to exit in my experience.
Overall, it's a tiny net code removal, and better separation of concerns.
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Edited by ivan tkachenko