efl_ui_tab_bar: fix tab sizing issue
The default value of hint_align has changed.
So change the hint_align of tab(layout) to HINT_FILL.
- Recently, the size_hint_fill API has been added, but currently tab_bar is not available because it uses evas_object_box.
- I plan to change evas_object_box to efl.ui.box in the future.
Test Plan: elementary_test -to efl.ui.tab_pager
Reviewers: Jaehyun_Cho, YOhoho
Reviewed By: Jaehyun_Cho
Differential Revision: https://phab.enlightenment.org/D7835