Remove note source when cleaning it

little_boxes/activitypub.py

@@ -125,7 +125,7 @@ def clean_activity(activity: ObjectType) -> Dict[str, Any]:
     """Clean the activity before rendering it.
      - Remove the hidden bco and bcc field
     """
-    for field in ["bto", "bcc"]:
+    for field in ["bto", "bcc", "source"]:
         if field in activity:
             del (activity[field])
         if activity["type"] == "Create" and field in activity["object"]: