Revert "[Settings] Request focus in Add network dialog"

This reverts commit 49d314f8.

Reason for revert: Revert for proper fix in pi-dev branch. Solution in 
 http://ag/3714337 is proper fix to make all case in wifi dialog can get focus.

Change-Id: I99035a4c437ea6c033e3ba6a83e39967c236d973