notify: fix hide animation
notify: fix hide animation

This feature has been added long time ago but it never worked before.
I delayed the parent object hide call when hide signal is present
in theme.

Test:
1. elementary_test -to notify
2. Click Left and wait for timer to expire
3. Click Left and click "close" button on notify. Now hide animation
happens when notify hides.

@fix

rvandegrift/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,tasn/elementary,tasn/elementary,tasn/elementary,rvandegrift/elementary