Hygiene: Clean up formatting of search overlay

* Make dropshadow apply even if the only result is "search in page"
* Fix padding for search in page text
* Remove bottom-border of last result since there is nothing after
  it besides a dropshadow (otherwise it looks like a gap).

Change-Id: Ia7d551a8c5f53a3df707b8cfb294b1fd0a6ac6cc
Merge "Hygiene: Clean up formatting of search overlay"