Provide content insets while in SUW in portrait mode

- We keep the app setup flag set, but adjust the insets to
  inset SUW itself in portrait

Bug: 219879035
Test: With both 3button and gesture nav, verify that portrait
      mode SUW is always inset
Change-Id: Iad0b6c41feaa3fb169af75c071b7f9544b42bab7