MFA login flow and reuse-condition

[Ulf Seltmann]

I forgot something from authn.properties:

```ini
...
idp.authn.fudiscr.supportedPrincipals = \
  saml2/urn:de:zedat:fudis:SAML:2.0:ac:classes:CR
...
```

This is the OTP-plugin I am utilising.

cheers
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