Focus: first item should be focused when there is no focused/selected item

Focus: first item should be focused when there is no focused/selected item

Summary: First item of widget should be focused when focus comes to the widget for first time.

Test Plan:
elementary_test -to "Genlist Focus"
elementary_test -to "Gengrid Focus"
elementary_test -to "List Focus"
elementary_test -to "toolbar Focus"

Reviewers: seoz

Differential Revision: https://phab.enlightenment.org/D1135