Move ContactListFilterListener back to PeopleActivity

- It's not a good idea to put the listener in a fragment since
  we need to do a lot in PeopleActivity when filter changes, and
  filter may change when fragment is not added (and this is when
  b/31838582 happens).
- Change the style of ProviderStatusListener.

Bug: 31838582
Bug: 31829161
Bug: 30944495

Test: manual
  - follow steps to repro in the first 2 bugs
  - navigate between fragments
  - Add a contact to an account w/o contact and remove the only contact
    from it, to make sure ProviderStatusListener works.

Change-Id: Ie45065152db67bf2c7c7873a72038c6f1145d678