Hide unused fields

When ContactHeaderWidget.bindFromPhoneNumber is called with a number
that's not in contacts, onQueryComplete takes a path that doesn't hide
fields that don't apply to the current phone number. As a result, the
user sees the new number, but old data from the previous display (such
as the facebook status). With this change, those fields are hidden.
Fixes bug 2336977.

Change-Id: Ib6253c18dc58c3d28b463c87d5d195a84d613600