hoversel: improve key_action_move to handle disabled items

hoversel: improve key_action_move to handle disabled items

Summary:
Existing key_action_move logic used elm_widget_focus_cycle on hover,
but only handled the first and last item to move focus circularly.
So if the first or last item is disabled, focus movement is blocked.
This patch makes hoversel handle focus movement by itself to handle
disabled item better.

Test Plan: elementary_test -to hoversel

Reviewers: Hermet, cedric, Jaehyun

Differential Revision: https://phab.enlightenment.org/D3640

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>