Fix archival.py serialization paths

(cherry picked from commit 5c1574ce)

combo/modules/archival.py

@@ -75,7 +75,7 @@ def load_archive(url_or_filename: Union[PathLike, str],
         )
     model = Model.load(archive_file, cuda_device=cuda_device)
 
-    with open(os.path.join(archive_file, 'config.json'), 'r') as f:
+    with open(os.path.join(archive_file, 'model/config.json'), 'r') as f:
         config = json.load(f)
 
     data_loader, validation_data_loader = None, None