Show dialog if multiple candidates exist

In GB we show a list of phone number to call in Favorites
screen, while we don't now.

Also refrain PhoneNumberInteraction from showing a dialog
by itself but let a nested class do instead. showDialog() is now
obsolete and we should use DialogFragment instead.

Bug: 4743008
Change-Id: I202963c2f03424f07ee386bd9713fde4091a0ae2
8 files changed