Update visibility in moveTaskToBack if nothing is resumed

If it's possible that nothing will be resumed by moveTaskToBack (ie.
moving a freeform window to back in a multi-resume environment), then
we need to ensure that visibility is updated after re-ordering since
there will be no lifecycle changes to do it.

Bug: 134182971
Test: Open an app in freeform and move it to back. Observe it
      going invisible with a transition.

Change-Id: Iee7457ba7b8a7dc8385bed3a9434ab7c2490f14a