Fix wrong reference to self

Co-authored-by: Ludovic Pénet <ludovic.penet@dataiku.com>

Author: Valentin Thorey

dataikuapi/dss_plugin_mlflow/utils.py

@@ -45,7 +45,7 @@ def __init__(self, client, project_key, managed_folder, host=None):
                     b64encode("{}:".format(self.client._session.auth.username).encode("utf-8")).decode("utf-8")),
                 "DSS_MLFLOW_APIKEY": self.client.api_key
             })
-        elif self.internal_ticket:
+        elif client.internal_ticket:
             self.mlflow_env.update({
                 "DSS_MLFLOW_HEADER": "X-DKU-APITicket",
                 "DSS_MLFLOW_TOKEN": self.client.internal_ticket,