slapos_accounting: do not hardcode payzen payment mode

master/bt5/slapos_accounting/SkinTemplateItem/portal_skins/slapos_simulation/SaleInvoiceTransaction_postSlapOSGeneration.py

@@ -11,9 +11,6 @@ price_currency = invoice.getPriceCurrency()
 if invoice.getResource() != price_currency:
   invoice.setResource(price_currency)
 
-if invoice.getPaymentMode("") == "":
-  invoice.setPaymentModeValue(invoice.getPortalObject().portal_categories.payment_mode.payzen)
-
 if invoice.getCausality(None) is None:
   causality_list = []
   for line in invoice.objectValues():