Fix user mismatch in getUserRestrictionSources verification

The test is setting up the mocks and the fake user context in a way that can end up calling UserManager with the wrong user id (on HSUM, or otherwise with secondary users). As a quick fix, ignore the user in the verify() call, since the crucial part is checking that the DISALLOW_ADJUST_VOLUME restriction was the one queried.

Bug: 418336586
Test: ModesTileTest
Flag: TEST_ONLY
Change-Id: I29d7b38bd7b5841b7f3f1f7a13a94c6086c9c216