Dialer: Fix "Type a name of phone number" in search box display incomplete

The Widget.Material.ActionBar has 16dp to the right as the parent of
DialtactsActionBarStyle, and it will cause no enough room to show the text
"Type a name of phone number".

Override ActionBar title offset to keep search box aligned right.

Change-Id: I1a8878932f4517593cbfd628c27aba1228339e75
CRs-Fixed: 809652