[cts] fix testGetNamesForUids_valid

CtsShim now uses sharedUserId per ag/15985451.

BUG: 232559012
Test: atest CtsContentTestCases:android.content.pm.cts.PackageManagerTest#testGetNamesForUids_valid
Change-Id: I00bf0cbe5ab8652271814cf4969ea65b5fcf5b52
1 file changed