Fixed AutofillPreferenceCategory so it's UI is properly refreshed.

Test: manual verification
Test: runtest --path packages/apps/Settings/tests/unit/src/com/android/settings/core/PreferenceControllerContractTest.java
Bug: 65700540
Bug: 111838239

Change-Id: If4e80a47d65aea34b94271e43ac38612373f4fa2