elementary interface/scrollable: remove duplicated function calls for bars

elementary interface/scrollable: remove duplicated function calls for bars

Summary:
 *_visibility_apply() functions are called from each *_visibility_adjust()
function. And it is also called from _elm_scroll_scroll_bar_size_adjust().
So, calling *_visibility_apply() functions after calling
_elm_scroll_scroll_bar_size_adjust() is unnecessary.
@fix

Test Plan: N/A

Reviewers: raster, jaehwan, eagleeye, woohyun, cedric

Subscribers: jpeg

Differential Revision: https://phab.enlightenment.org/D3914

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