Make FILTER_TYPE_ALL_ACCOUNTS default

* Use FILTER_TYPE_ALL_ACCOUNTS filter if the activity opens for the
  first time (i.e. is not re-created).
* Don't persist filter other than FILTER_TYPE_ALL_ACCOUNTS.
* Handle back button behavior based on filter type: if type is not
  FILTER_TYPE_ALL_ACCOUNTS, change filter to FILTER_TYPE_ALL_ACCOUNTS.

Bug 28882119
Bug 29056572

Change-Id: I93c86ab80aeb91ea18f125ee779a9642a40b49b0