evas_events: fix wrong event listening

evas_events: fix wrong event listening

EFL_EVENT_FOCUS_IN is wrong here, EFL_EVENT_FOCUS_IN is called on object
that received object focus. Not canvas focus, however, the code in the
callback there seems to be mainly for canvas focus handling.

Additionally, in evas_events, the event handler that was listening for
the canvas focus in / out events expected a event type, which is also
not correct, because the canvas focus in / out does not have one. In
order to catch such errors later more easily, there is now a safety
check, so we really fetched the correct seat.

Reviewed-by: YeongJong Lee <yj34.lee@samsung.com>
Differential Revision: https://phab.enlightenment.org/D9191