Use WorkerConfiguration instead of WorkerRun.configuration

Requires backend!1529

Closes #93 (closed)

arkindex_worker/worker/base.py

@@ -168,7 +168,9 @@ class BaseWorker(object):
             )
             configuration_id = worker_run.get("configuration_id")
             if configuration_id:
-                worker_configuration = self.request("RetrieveWorkerConfiguration", id=configuration_id)
+                worker_configuration = self.request(
+                    "RetrieveWorkerConfiguration", id=configuration_id
+                )
                 self.user_configuration = worker_configuration.get("configuration")
                 if self.user_configuration:
                     logger.info("Loaded user configuration from WorkerRun")