[FIX] account: invoice pivot do not display unsigned

On the pivot view, there is the following unsigned measure fields:
"account_tax" and "account_untaxed".

It can cause mistakes since for example the sum of a invoice an its
full credit note should be zero, but here it will be double the amount.

So here we complete 97aec9f8 for two fields that were still available.

opw-2071027
closes #36940

closes odoo/odoo#36971

X-original-commit: 2dc8e2feec9e5b604e0c0acae52562822a113342
Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>

addons/account/views/account_invoice_view.xml

@@ -21,8 +21,10 @@
                 <pivot string="Invoices" display_quantity="true">
                     <field name="partner_id"/>
                     <field name="amount_total_company_signed" type="measure"/>
+                    <field name="amount_tax" invisible="1"/>
                     <field name="amount_total_signed" invisible="1"/>
                     <field name="amount_total" invisible="1"/>
+                    <field name="amount_untaxed" invisible="1"/>
                     <field name="residual_signed" invisible="1"/>
                     <field name="residual" invisible="1"/>
                 </pivot>