Show CombinedBiometric if active unlock enabled

We want to show this page as long as active unlock is enabled. The
underlying check of isAvailable checks if the appropriate biometrics are
available and updates the title accordingly.

Test: manual test, confirm combined page appears when active unlock on
Test: atest BiometricsSafetySourceTest
Bug: 264812908
Change-Id: I5da1c20d65b879751bdd615c14c2f8a71cc54d80