nfc: fix formatting in comment (tab vs spaces) in src/saml2/entity.py

Co-authored-by: Ivan Kanakarakis <ivan.kanak@gmail.com>

Author: vladimir-mencl-eresearch

src/saml2/entity.py

@@ -207,7 +207,7 @@ def reload_metadata(self, metadata_conf):
         """
         Reload metadata configuration.
 
-	Load a new metadata configuration as defined by metadata_conf (by
+        Load a new metadata configuration as defined by metadata_conf (by
         passing this to Config.load_metadata) and make this entity (as well as
         subordinate objects with own metadata reference) use the new metadata.