elm_notify: finish the hiding forcibly if get interrupt

elm_notify: finish the hiding forcibly if get interrupt

The notify was not hidden when following case
 - change the theme while hide is on going
 - show while hide is on going
 - hide finished calback is invoked hide is not on going
 - prevent hide or dismiss call during hididing

 + for duplicated hide event, if dismiss is called, remove timer

original patch list
 https://review.tizen.org/gerrit/#/c/117200/
 https://review.tizen.org/gerrit/#/c/124481/

@tizen_fix

Change-Id: I40078334a19ea9bb2bb6ce6a897d67d302dc741f
Signed-off-by: JinYong Park <j4939.park@samsung.com>