fix(tests): reverted the date to ds change

Signed-off-by: Cortland Goffena <30168413+cmgoffena13@users.noreply.github.com>

Author: cmgoffena13

sqlmesh/cli/project_init.py

@@ -229,7 +229,7 @@ def _gen_example_objects(schema_name: str) -> ExampleObjects:
 FROM
   {seed_model_name}
 WHERE
-  event_date BETWEEN @start_ds AND @end_ds
+  event_date BETWEEN @start_date AND @end_date
   """
 
     sql_models[seed_model_name] = f"""MODEL (