Disable unify_camera_policies flag when testing force-rotate policy.

This policy is deprecated in favour of simulate-requested-orientation camera compat policy, which is more versatile. The test should still exist while the flag is rolled out, but test with flag disabled.

Flag: EXEMPT test only
Bug: 432218134
Test: atest WmTests:AppCompatCameraPolicyTest
Test: atest WmTests:AppCompatOrientationPolicyTest
Change-Id: I7f8088d451f22c71079acd31f58e6dab8251b2fc