efl_ui_spin_button: cleanup internal data

efl_ui_spin_button: cleanup internal data

there is no reason to store those two times in the internal data, as
they do not change at all. Additionally, saving the direction in the
internal data has also no reason, since it is *always* used in the call
after the setting, so this makes this a parameter.

Reviewed-by: Xavi Artigas <xavierartigas@yahoo.es>
Differential Revision: https://phab.enlightenment.org/D9229