Fix work account setup lock screen content for face auth

For devices which provide biometric authentication options, such as
fingerprint or face, we should be showing different content on the lock
setup screen during the corp account setup wizard. Namely, the title
should read "Choose screen lock", and the "Not now" option should be
changed to "Continue without [auth method]". However, we currently only
check for whether fingerprint authentication is available, leading to
incorrect text for devices with face authentication.

This CL fixes the issue by changing the introducing a private method to
check for any biometric authentication (currently just mForFingerprint ||
mForFace). It then uses this method in place of the existing
mForFingerprint checks in SetupChooseLockGeneric.

Test: On a device with fingerprint auth and one with face auth:
1. Set a work profile with TestDPC and add some password quality requirement
2. adb shell settings put global device_provisioned
3. adb shell am start -a android.app.action.SET_NEW_PARENT_PROFILE_PASSWORD
4. Verify that the correct content is now shown (screenshot/xZPVtpa3j3Z)
5. Verify that setting lock with and without biometric auth still works

Fixes: 136556653

Change-Id: I46d3c964f05986aa97cc8ed77fe0ac125337ddd0