Biometric unlock only with master key

[LiaraAlis]

At the moment it is possible to enable biometric unlock when a password is used. But it is not possible when the database is only unlocked with a key file. I think it should be also possible to use biometric unlock when only using a key file. So it could be senseful that the key file is only selected after biometric unlock. If not successful, path to the key file should be empty.

[J-Jamet]

Duplicate #1315