Play fallback animation if icon in All Apps is covered by header.

Bug: 230707341
Test: enter all apps
      scroll so icon is covered by header
      open app, swipe back to return to all apps
      confirm fallback animation plays

      repeat but scroll so icon is not covered by header
      confirm normal animation plays

Change-Id: I56cda07f3eccc11e8909f7fb28210f65cc6e0f1d