Since b90cae0650, the domain from
_loder_params_product_product is ignored. But the utility products that are
supposed to be loaded are declared in that method. In this commit, we now
override the _get_available_product_domain to make sure the utility products are
loaded when opening a pos session.
closes odoo/odoo#148098
Related: odoo/enterprise#53653
Signed-off-by: Adrien Guilliams (adgu) <adgu@odoo.com>