[FIX] rma_sale: Show directly form on 1 RMA

Fine-tune of 9a25d6, as for one record, the domain is not applied, but the list is
shown.

rma_sale/models/sale.py

@@ -62,6 +62,7 @@ class SaleOrder(models.Model):
             action.update(
                 res_id=rma.id,
                 view_mode="form",
+                views=[],
             )
         else:
             action['domain'] = [('id', 'in', rma.ids)]