[FIX] account: invoice line form ok studio context
[FIX] account: invoice line form ok studio context

Correct account invoice line form view so studio doesn't fail on
something that doesn't seem really correct (and somehow worked thanks
to pyeval implementation or the override from another view type).

opw-1826254
opw-1830171
closes #23997

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo