Tighten up loading of visible task data

- Certain animations can run after the launcher state has changed,
  triggering loading of task data even when the overview state is not
  visible. Only allow re/loading of this data when we are in the overview
  state.

Bug: 76162466
Change-Id: Ie1f492ef712ea4aa2db6f2e1bc7ba4390742875b
1 file changed