dialer: Fix all_contacts button not being attached

When the dialer has no favorites settings the param of the parent of the favorites listview
caused all_contacts button is not being attached to the listview, and doesn't received events.

Change-Id: I0cf83b4ea4b3b3392898ed088ec11b3e706d86ca
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>