Force hiding fill UI when it's destroyed.

The bug describes a scenaior where drop down UI is not removed even when
tapping on other fields. Forcing hiding dropdown UI fix this issue. For
reason why it would fix it needs more understanding.

Test: atest CtsAutoFillServiceTestCases
Bug: b/290917485

Change-Id: Id4940093aad5dcb290a494245052ba2ce9321aec