Clear occluded transition flag if it becomes visible

In case when swiping an auto pip activity with display change,
the visibility could be toggled as visible->invisible->visible
when collecting. So the flags should be updated to avoid
disturbing transition info.

Bug: 340367710
Test: Swipe auto-pip activity and rotate at the same time.
      The change info of pip task should not contain flags.
Change-Id: Ia9c78105f4a9782c156744e6cb38681f265955a0