elm_focus: fix mislocation error during continuous focus movement

elm_focus: fix mislocation error during continuous focus movement

Summary:
When focus is moved fast and continuously, newly created animator
conflicts with the animator for previous movement, so focus bounces
among locations.
This patch removes previous animator and move focus to the final
location before creating new animator.

Test Plan:
elementary_test -to focus
elementary_test -to genlist

Reviewers: raster, jpeg, cedric, Jaehyun_Cho

Differential Revision: https://phab.enlightenment.org/D3611