Correcting default value for write_options in recreate_training_data (#1166)

Author: manu-sj

Diff for: python/hsfs/feature_view.py

@@ -1656,7 +1656,7 @@ def create_train_validation_test_split(
     def recreate_training_dataset(
         self,
         training_dataset_version: int,
-        write_options: Optional[Dict[Any, Any]] = None,
+        write_options: Optional[Dict[Any, Any]] = {},
         spine: Optional[
             Union[
                 pd.DataFrame,