Fix testCannotRemoveUserIfRestrictionSet for a managed profile.

When the PO is running in a managed profile: setting
DISALLOW_REMOVE_USER has no effect. So don't run the test
testCannotRemoveUserIfRestrictionSet

BUG:33098551
Test: cts-tradefed run cts --module CtsDevicePolicyManagerTestCases --test
com.android.cts.devicepolicy.MixedManagedProfileOwnerTest#testCannotRemoveUserIfRestrictionSet

Change-Id: I507708ca89dd3b7f2b45ed5856e750de9b5de7dd
1 file changed