[FIX] portal: VAT modification
[FIX] portal: VAT modification

The route `/my/account` doesn't implement any restriction for the VAT
modification. This allows users to modify the VAT number although they
shouldn't.

We make the restriction consistent with the backend:

https://github.com/odoo/odoo/blob/e0c7a368580dfeac9af8dc3cb3a10fc33bf4b521/odoo/addons/base/res/res_partner_view.xml#L247

opw-2056727

closes odoo/odoo#36031

Signed-off-by: Nicolas Martinelli (nim) <771435c469f83f6aa9c405ac5e1ed06314a94f2d@odoo.com>
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo