Catch exception when stopping OTP session twice

An uncaught IllegalArgumentException thrown in
ActivityManager.removeOnUidImportanceListener would result in a one-time
permission session for a background group sometimes not getting cleaned
up properly, leading to background permissions not geting revoked.

Test: run cts -m CtsPermissionTestCases -t
android.permission.cts.RevokeSelfPermissionTest
Bug: 225386829

Change-Id: Iad7f181866b407d556672457ade1f3312d10a95d