Test that authenticatorDisplayName is allowed in credProps

Author: emlun

webauthn-server-core/src/test/scala/com/yubico/webauthn/RelyingPartyRegistrationSpec.scala

@@ -261,6 +261,7 @@ class RelyingPartyRegistrationSpec
                   "org.example.foo": "bar",
                   "credProps": {
                     "rk": false,
+                    "authenticatorDisplayName": "My passkey",
                     "unknownProperty": ["unknown-value"]
                   }
                 }