[WIP] fixup! erp5_pdm: add supply_cell_interaction_workflow

isn't it bad to call the parent value, as it will be called X times, X bein the number of cells

bt5/erp5_pdm/WorkflowTemplateItem/portal_workflow/supply_cell_interaction_workflow/scripts/SupplyCell_updateSliceBasePrice.py

 supply_cell = state_change['object']
+supply_line = supply_cell.getParentValue()
 if supply_cell.getParentValue().isBasePricePerSlice():
-  supply_cell.setSliceBasePrice(supply_cell.getBasePrice())
+  supply_line.updateCellSliceParameterList(base_id='path')
 else:
-  supply_cell.setSliceBasePrice(None)
+  supply_line.updateCellSliceParameterList(base_id='path')