Avoid restarting when updating config

Author: gabegma

azimuth/app.py

@@ -329,9 +329,7 @@ def initialize_managers_and_config(
         cluster: Dask cluster to use, if different than default.
     """
     global _task_manager, _dataset_split_managers, _azimuth_config
-    if _task_manager:
-        _task_manager.restart()
-    else:
+    if not _task_manager:
         _task_manager = TaskManager(cluster, azimuth_config.large_dask_cluster)
 
     _azimuth_config = azimuth_config