els_box : Move horizontal condition out of some loop in _els_box_layout

els_box : Move horizontal condition out of some loop in _els_box_layout

Summary:
Almost logic of both horizontal and vertical are same except different axis in
_els_box_layout.
This patch reduced code size and improved speed little bit by moving condition
out of the loop using some extra pointer variables.

In addition, removed unnecessary check routines.
There are already similar logic for them before and after.

Reviewers: raster, seoz, cedric

Reviewed By: raster

Differential Revision: https://phab.enlightenment.org/D423