fix linter

Author: Stanislav Lysikov

flask_appbuilder/security/manager.py

@@ -987,7 +987,10 @@ def _search_ldap(self, ldap, con, username):
                 nested_groups_filter_str,
                 nested_groups_request_fields,
             )
-            log.debug("LDAP search for nested groups returned: %s", nested_groups_search_result)
+            log.debug(
+                "LDAP search for nested groups returned: %s",
+                nested_groups_search_result,
+            )
 
             nested_groups = [
                 x[0].encode() for x in nested_groups_search_result if x[0] is not None