Fix NPE due to uncomputed formatted phone numbers

Compute the formatted phone number in the case that it
was not computed from the ContactLoader.  This can happen
because contacts loaded via the QuickContacts activity are
passed into the ContactDetailFragment, but the formatted
phone numbers are not computed in QuickContacts.

Bug: 7003015
Change-Id: I999b6ba8e3e3292b055a8fa1fe667a5c8304c983