Change padding in account selection dialog (1/2)

This CL fixes the padding in account selection dialog opened
when pressing the floating action button to add a contact.

Screenshots: https://drive.google.com/a/google.com/folderview?id=0BwSNbQ_IWQd2Zlh0OExxSkJtQ0U&usp=sharing

Bug: 22292872
Change-Id: I0ed696ac7c4adcd63d86eb3f5984f0e1c165abf8