Use also cost price for customer credit note

The unit price for incoming product from customer contains the sale price and
not the actual cost price.

issue4097
review12521002

stock.py

@@ -131,7 +131,7 @@ class Move:
             if consumed_qty >= quantity:
                 break
 
-            if type_.startswith('in_'):
+            if type_ == 'in_supplier':
                 with Transaction().set_context(date=move.effective_date):
                     unit_price = Currency.compute(move.currency,
                         move.unit_price, move.company.currency, round=False)