Restore the "Contacts to display" custom filter (1/3)

* Revert "Remove AccountFilterActivity and its usage (Contacts)"
  This reverts commit 1fc8847a.
* But we don't restore the changes to DefaultContactBrowseListFragment
  since we won't be starting the "Contacts to display" filter
  from an overflow menu option on PeopleActivity.
* In DrawerActivity and PeopleActivity, everywhere we check for
  FITLER_TYPE_ALL_ACCOUNTS, we must also accept FILTER_TYPE_CUSTOM,
  since either of those can be used for the default/main contacts
  list again.

Bug 29185471

Change-Id: Ie77e8acb16980b9015bd1f1f4af9fb7a014f3c51