PBAP: Allow invisible contacts to share

This change will make possible to share the invisible
contacts also via PBAP since in the recent new builds,
all the phonebook contacts have their in_visible_group
property as FALSE. Also there is no such restrictions for
sharing invisible contacts as per spec.

Change-Id: Id830fc105e230bfd1c17493e464a1baecc4ca841
CRs-fixed: 740311