multibuttonentry: Delete duplicate running code.

multibuttonentry: Delete duplicate running code.

Summary:
When layout clicked, "elm_widget_on_focus()" called with "entry_focus_in()" callback.
The "view update" and "focus set to entry" already call in those callbacks, so i deleted duplicate code and it also make focus issue when user click the entry to add item.
@fix

Test Plan:
Run elementary_test.

1. excute multibuttonentry.
2. click the entry area.
3. see the elm_widget_on_focus called twice.
   (layout callback function called view update -> elm_box_unpack called in view update ->
    entry lose focus -> on_focus_callback call again)

Reviewers: Hermet, seoz, Jaehyun_Cho, JackDanielZ

Differential Revision: https://phab.enlightenment.org/D1902