Use the older way to cope with onInvalidSelection()

Although we're showing "all contacts" list when the selected
contact isn't in the current filtered list, we don't explicitly
select the contact, thus detail page ends up to showing
previously selected contact.

We can partly achieve it, by selecting the contact uri programatically
after showing "all contacts" list, but then, the next problem would be,
what should be done when even the "all contacts" list does not have
the requested contact.

The case is super rare (since "all contacts" should include almost all
contacts users usually want) but still possible, and there's no easy way
to determine the edge case.

One possible workaround for this rare case is to try to show "all
contacts" once and fall-back to single contact mode if the requested
contact isn't there. Though it sounds feasible, the change would become
a bit too risky at this point. For example, it may be very slow with
larger database.

Let's just show single contact for now, and show correct directory
header.

See also Ica75178d10b4a9b95c44cc4f75f56b65fbc67da8 for the code
introducing single contact mode.

TESTED (on phone):
- This change should not affect People UI for Phone.

TESTED (on tablet):
- set custom filter with no contacts, and create a contact.
  We should show the contact both in the list and detail.
- set custom filter with no contacts, launch quick contact
  via favorite screen, and open contact detail via the quick
  contact.
  We should show the contact both in the list and detail.
- set custom filter with no contacts, launch the other app
  which relies on quick contact, and open contact detail the
  quick contact.
  We should show the contact both in the list and detail.

Bug: 5193999
Change-Id: I233162572e25acb737c9eae787dfc146879a0dc2