Revert "scroller : fix mirrored contents_pos_set call"

Revert "scroller : fix mirrored contents_pos_set call"

Summary:
This reverts commit de313d6296ac8a2d9a3c0f9762179ffd42a833ff.

Because x-coordination mirroring is called properly from wanted_regison_set.
There was a problem in scroller init process.
Before edje_obj was initialize in elm_interface_scrollable_objects_set, mirrored_set was being called.
So Move mirrored_set after elm_interface_scrollable_objects_set
it can fix this issue(https://phab.enlightenment.org/D4944)

Reviewers: raster, woohyun, SanghyeonLee, akanad, eagleeye, cedric, singh.amitesh, eunue

Subscribers: jpeg, cedric

Differential Revision: https://phab.enlightenment.org/D4945