focus: Fixed focus issue that the highlight was not visible on first

focus: Fixed focus issue that the highlight was not visible on first
click.

Summary:
Focus highlight was not visible on first click on a widget with focus_highlight enabled on the window.
This happens because on first click, the "elm,action,focus,show" signal was emitted before setting focus highlight edje object as theme object of elm window.
In this patch, moved the  _elm_win_focus_highlight_visible_set() call after focus highlight edje object set as theme object of window.
This fixes T774.

Test Plan:
elementary_test->focus then click any widget. Focus won't appear for the first time.

Reviewers: seoz, raster, woohyun

Maniphest Tasks: T774

Differential Revision: https://phab.enlightenment.org/D462