KeyMint: fix auth test HAT

The test case for an auth-per-operation HAT with an invalid HMAC
is wrong -- it is re-using the previous HAT, which fails for a
different reason (has an old challenge).

Fix the test to use the HAT that's wrong in the intended way.

Bug: 297333975
Test: VtsAidlKeyMintTargetTest
Change-Id: I15fe9b0c1b53452df0f67dd44534fdb80a6c2a9c