✏️(backend) fix read_only_fields is_favorite

is_favorite has a typo error.
This commit fixes it.

Author: AntoLC

src/backend/core/api/serializers.py

@@ -201,7 +201,7 @@ class Meta:
             "abilities",
             "created_at",
             "creator",
-            "is_avorite",
+            "is_favorite",
             "link_role",
             "link_reach",
             "nb_accesses",