Fix tests for BiometricsSafetySource and LockScreenSafetySource.

It seems these tests have been failing for a while (probably they were never passing in the first place; as the issue appears to be with the tests and not the prod code).

Are they not being run on pre and/or post-submit?

Bug: 323649900
Test: atest LockScreenSafetySourceTest && atest BiometricsSafetySourceTest
Change-Id: Ie75241455317da6749ccf648dae71c49ea9f766f