Respect the app requested orientation in kids mode

The logic was unexpectedly removed from commit:
ea896c4c

This CL restores the logic back.

Fix: 312443253
Test: Open a portrait-only app while the screen orientation is
      landscape. Make sure the screen orientation is rotated to
      portrait.
Change-Id: I7119e8c65ca49386e431b153ada443789a864825