Fix writing client metadata

hiboo/sso/oidc.py

@@ -112,7 +112,7 @@ class Client(sqla_oauth2.OAuth2ClientMixin):
         self.client_secret = service.config["client_secret"]
         # Configuration is stored in a format compatible with authlib metadata
         # so it only needs to be passed to the authorization server object
-        self.client_metadata = service.config
+        self.__dict__["client_metadata"] = service.config
         self.authorization = flask_oauth2.AuthorizationServer(query_client=self.query_client, save_token=self.save_token)
         self.authorization.generate_token = self.generate_token
         # Register all grant types