update self.config with default user_configuration values

closes #113 (closed)

arkindex_worker/worker/base.py

@@ -176,7 +176,7 @@ class BaseWorker(object):
                     "user_configuration"
                 ].items():
                     if "default" in value:
-                        self.user_configuration.update({key: value["default"]})
+                        self.user_configuration[key] = value["default"]
             self.worker_details = worker_version["worker"]
             required_secrets = worker_version["configuration"].get("secrets", [])
         elif self.args.config: