Ensure we get the right nav bar mode for the current user in the system

- Load resources from the current user's context to ensure the right
  overlays are read

Bug: 130185871
Test: atest DisplayPolicyInsetsTests
Test: atest DisplayPolicyLayoutTests

Change-Id: I37b01426f02202241050336e605bbfe1918724a5
Signed-off-by: Winson Chung <winsonc@google.com>
3 files changed