Cleanup in BigPictureIconManager

- Make sure that displayedState is in sync with the drawable that we've
set on the consumer.
- User clearInvocations in the tests instead of resetting the mocks.

Bug: 283082473
Test: atest BigPictureIconManager
Change-Id: I94571e4caeb8302c5aa836f01f8ac2cd1563c7c2
2 files changed