Scroller: Improvement in _key_action_move() calculations.

Scroller: Improvement in _key_action_move() calculations.

Summary:
If x coordinate is equal to 0, key action is no more
effective as EINA_FALSE is returned. This is creating problem
in looping. Looping will be done when x < 0, but as soon as
x == 0, _key_action_move starts returning EINA_FALSE. Same
thing applies to y coordinate and other extremities.

@fix

Signed-off-by: Umesh Tanwar <umesh.tanwar@samsung.com>
Test Plan: elementary_test -> Scroller -> Loop in X axis -> scroll left using left key(looping does not happen)

Reviewers: raster, Hermet, cedric, singh.amitesh, SanghyeonLee

Reviewed By: SanghyeonLee

Subscribers: sachin.dev, SanghyeonLee, eagleeye

Differential Revision: https://phab.enlightenment.org/D2778