🚨(backend) fix lint on test file

Signed-off-by: Paul Vernin <paul.vernin@gmail.com>

src/backend/core/tests/documents/test_api_documents_favorite_list.py

@@ -115,6 +115,7 @@ def test_api_document_favorite_list_with_favorite_children():
     assert content[1]["id"] == str(children[1].id)
     assert content[2]["id"] == str(access.document.id)
 
+
 def test_api_document_favorite_list_with_deleted_child():
     """
     Authenticated users should not see deleted documents in their favorite list.
@@ -138,4 +139,4 @@ def test_api_document_favorite_list_with_deleted_child():
     content = response.json()["results"]
 
     assert content[0]["id"] == str(root.id)
-    assert content[1]["id"] == str(child2.id)
+    assert content[1]["id"] == str(child2.id)