Fix mypy type error:

src/databricks/sql/thrift_backend.py:356: error: Not all arguments converted during string formatting

Author: susodapop

cmdexec/clients/python/src/databricks/sql/thrift_backend.py

@@ -353,8 +353,8 @@ def _check_initial_namespace(self, catalog, schema, response):
             if not response.canUseMultipleCatalogs:
                 raise InvalidServerResponseError(
                     "Unexpected response from server: Trying to set initial catalog to {}, "
-                    + "but server does not support multiple catalogs.".format(catalog)
-                )  # type: ignore
+                    + "but server does not support multiple catalogs.".format(catalog)  # type: ignore
+                )
 
     def _check_session_configuration(self, session_configuration):
         # This client expects timetampsAsString to be false, so we do not allow users to modify that