key events of the scroller treat in event_hook

key events of the scroller treat in event_hook

Author:    Helen Fornazier <helen.fornazier@profusion.mobi>

The idea of the treatment of the key downs events in the smart scroller
is be equal to any widget that use it. But to do this, the smart
scroller must listen to the EVAS_CALLBACK_KEY_DOWN, this will cause a
problem to list, genlist, gengrid, because the event will arrive first
to the smart scroller then to this widgets (because the widgets are
listening the event by event_hook). So, if the scroller treat "Up", the
genlist will not select the item above because this event was already
treat by the scroller.

Now the tratment of the keys was tranfer to the elm_scroller instead of
els_scroller.

SVN revision: 52962