[FIX] account: fix inconsistency of vendor bill refunds in views
[FIX] account: fix inconsistency of vendor bill refunds in views

In vendor bill refunds they are not showing fields 'amount_untaxed' and
'amount_tax' with signed computation on views so there is inconsistency
in credit notes and vendor bill refunds.

After this commit in vendor bill refunds, fields are shown with signed
computation on views.

task-2008613

closes odoo/odoo#34086

Signed-off-by: Quentin De Paoli (qdp) <e3f4db239cf86136ad4659223e6cc0134ae205fb@openerp.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo