Minor bug fixes related to package/dpc removal

Bug: 277749962
Test: a.d.c.AccountManagementTest#setAccountManagementDisabled_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.AccountManagementTest#setAccountManagementDisabled_setByPermission_appRemoved_notEnforced
Test: a.d.c.ApplicationHiddenTest#setApplicationHidden_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.ApplicationHiddenTest#setApplicationHidden_setByPermission_appRemoved_notEnforced
Test: a.d.c.BlockUninstallTest#setUninstallBlocked_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.BlockUninstallTest#setUninstallBlocked_setByPermission_appRemoved_notEnforced
Test: a.d.c.LockTaskTest#setLockTaskPackages_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.LockTaskTest#setLockTaskPackages_setByPermission_appRemoved_notEnforced
Test: a.d.c.PersistentPreferredActivitiesTest#addPersistentPreferredActivity_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.PersistentPreferredActivitiesTest#addPersistentPreferredActivity_setByPermission_appRemoved_notEnforced
Test: a.d.c.ScreenCaptureDisabledTest#setScreenCaptureDisabled_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.UserRestrictionsTest#addUserRestriction_setByDPCAndPermission_DPCRemoved_stillEnforced
Test: a.d.c.UserRestrictionsTest#addUserRestriction_setByPermission_appRemoved_notEnforced
Test: a.d.c.DeviceManagementCoexistenceTest#multiplePoliciesSet_dpcRemoved_removesPolicies
Change-Id: I103598be772376d629a40598631aafb474c56495