Make the theme for choose account and choose account type dialogs same.

Contacts app uses a custom account picker which calls the system account picker
when an account needs to be added. The system accout picker invokes choose
accout type dialog which overlays over the system acccount picker. Because these
two dialog boxes use different themes, he one behind is wider than the one in
foreground and ends up looking like a thin black strip protruding from the two
sides.
Bug: 6980517

Change-Id: Ia8b23767d995dcbe1a58087cb4bfbee140c2c744