SimulationTool: re-order arguments for consistency

product/ERP5/Tool/SimulationTool.py

@@ -660,9 +660,9 @@ class SimulationTool(BaseTool):
         group_by_function_category=0,
         group_by_function_category_strict_membership=0,
         group_by_date=0,
+        group_by=None,
         # sort_on
         sort_on=None,
-        group_by=None,
         # keywords for related keys
         **kw):
       """