Fix DND display error when caller is DO/PO

DPM calls should check uid instead of the calling uid.

It is 'pkg' that we want to check access for, not the caller which is
especially true for Settings app (caller) which needs to display DND
details for each app (package in query).

Bug: 292163859
Bug: 291863956
Test: atest FrameworksUiServicesTests
Test: atest FrameworksServicesTests:DevicePolicyManagerTest
Test: atest CtsAdminTestCases:DevicePolicyManagerTest
Test: atest NotificationManagerServiceTest
Change-Id: I15b84dc48cf5225749998c0e25ab8f599235c283