Fix configuration change state transitions.

- Do not ever do onDestroy/onCreate cycle for VR activities when
  configuration is changed due to VR mode UI change.
- Do not gate on global configuration change check, as updates
  to the global UI mode configuration can race with activity
  lifecycle changes.

Bug: 36491752
Bug: 36515684

Test: Manually checked activity lifecycle for pre-O, O VR apks.

Change-Id: Ic2739c6e78c1bdfe876bf1302cd0adeaadece15c