Revoke 'always' web handler status when not autoverifying

If an app has previously used autoVerify to make claims about its status
re handling web navigation intents, but is updated such that it no
longer makes those claims, step down its "official handler" status as
though it had never invoked autoVerify in the first place.

Bug: 146204120
Test: manual: as described in bug; observe policy before/after via
      'adb shell dumpsys package d'
Test: atest CtsOsHostTestCases
Change-Id: I58502d1b32d793aba9aa772fa2ad5ac38acca48a
Merged-In: I58502d1b32d793aba9aa772fa2ad5ac38acca48a