call-notification: Make sure we always show a phone number when available

Guido Günther requested to merge guidog/phosh:call-noti-caller into main

For calls that don't have an entry in the address book we want to make sure we only show the phone number and nothing else (not e.g. "Unknown Caller") while the reset of the logic (whether to show initials, etc) should stay the same.

Signed-off-by: Guido Günther

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