Fix user IDs in chooser activity tests

The tests had hardcoded user IDs, which doesn't work well for HSUM.
Fix it by using relative numbers.

Test: atest FrameworksCoreTests_internal_app:com.android.internal.app.ChooserActivityTest
Fix: 405062600
Fix: 401722120
Fix: 397211985
Fix: 408025667
Flag: TEST_ONLY
Change-Id: Id30b762cdaaac5f6975fabce2f8731af978e54b9