Pixel tweak search dialog to match search widget

- Remove one pixel of margin from the left of the voice
  search button icon.
- Move magnifying glass icon one pixel downwards (= remove
  one pixel of padding at the bottom and add one at the top).
- Remove one pixel of margin from the bottom of the button
  backgrounds.
- Remove one pixel of padding from the left of the
  search button background.
- Remove one pixel of padding from the left and add one to
  the right of the voice search button background.

Fixes http://b/issue?id=2160857
"Pixel tweak search layouts to match widget"

Change-Id: I76d7ba6128f13f3d29b03a89e9862df355874e06