[client] Fix observed data ID generation

Author: SamuelHassine

pycti/entities/opencti_observed_data.py

@@ -216,7 +216,7 @@ def generate_id(object_ids):
         data = {"objects": object_ids}
         data = canonicalize(data, utf8=False)
         id = str(uuid.uuid5(uuid.UUID("00abedb4-aa42-466c-9c01-fed23315a9b7"), data))
-        return "observed-datae--" + id
+        return "observed-data--" + id
 
     """
         List ObservedData objects