Fixed a few bugs in NUI Main Activity.

 - Normalized the search query returned from DialpadFragment
 - Dial button now updates when given a psuedo emergency number
 - 'Clear frequents' now displays and functions properly in the menu
 - Added simulator to the menu

Bug: 72525324
Test: added tests for clear frequents (only prod feature).
PiperOrigin-RevId: 186875815
Change-Id: I3bad3c71b355b987fc85777550bfa1de5028c3a4