Fix regression in assistant window handling

- Skip the assistant as the running task when handling swipe up
- Also ensure that we fall into the overview input consumer if we are
  swiping it from the assistant over home
- Skip accounting for the scroll offset when there is no running task

Bug: 136282913
Change-Id: I28e45e407702d6d6aebaa0232cd96ccb10047644
2 files changed