erp5_trade: use new getAggregatedAmountList API in Base_getSpecialisedAggregatedAmountList.

bt5/erp5_trade/SkinTemplateItem/portal_skins/erp5_trade/Base_getSpecialisedAggregatedAmountList.py

-specialise = context.getSpecialiseValue(portal_type=('Purchase Trade Condition',
-                                                     'Sale Trade Condition',
-                                                     'Internal Trade Condition',))
-
-if specialise is not None:
-  rounding = kwargs.get('rounding', False)
-  return specialise.getAggregatedAmountList(context, rounding=rounding)
-
-return []
+rounding = kwargs.get('rounding', False)
+return context.getAggregatedAmountList(rounding=rounding)