Dialer: un-derp the keypad UI

Commit 9f95938d15b77174ad1bdc376e2ee2507516303b made
bottom dialer buttons jump to the sides when keypad is open
and added a weird "line" below the keys.
https://dl.dropboxusercontent.com/u/16268774/open_old.png
This patch fixes the issue and restores the old look:
https://dl.dropboxusercontent.com/u/16268774/open.png

Change-Id: Ib0eb7214d117e2245fa54be4ee9feeba1b5b38a3