Fill currency and company for non-line invoice line

Since issue9854 those fields are always required.

issue10530
review375831002
(grafted from 6d2027238acaf896f899a5ba07fcfd63270aa818)

--HG--
branch : 6.0

sale.py

@@ -1475,6 +1475,8 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
 
         invoice_line = InvoiceLine()
         invoice_line.type = self.type
+        invoice_line.currency = self.currency
+        invoice_line.company = self.company
         invoice_line.description = self.description
         invoice_line.note = self.note
         invoice_line.origin = self
@@ -1499,8 +1501,6 @@ class SaleLine(TaxableMixin, sequence_ordered(), ModelSQL, ModelView):
         invoice_line.unit_price = self.unit_price
         invoice_line.taxes = self.taxes
         invoice_line.invoice_type = 'out'
-        invoice_line.currency = self.currency
-        invoice_line.company = self.company
         if self.product:
             invoice_line.account = self.product.account_revenue_used
             if not invoice_line.account: