[FIX] hr_expense: elevate privilege in order to subscribe users (closes #13436) (opw-687508)
[FIX] hr_expense: elevate privilege in order to subscribe users (closes #13436) (opw-687508)

storm-computers/odoo,microcom/odoo,hip-odoo/odoo,storm-computers/odoo,laslabs/odoo,dfang/odoo,laslabs/odoo,Elico-Corp/odoo_OCB,ygol/odoo,laslabs/odoo,ygol/odoo,bplancher/odoo,microcom/odoo,dfang/odoo,storm-computers/odoo,Elico-Corp/odoo_OCB,ygol/odoo,dfang/odoo,laslabs/odoo,bplancher/odoo,microcom/odoo,ygol/odoo,dfang/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,laslabs/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,hip-odoo/odoo,storm-computers/odoo,bplancher/odoo,storm-computers/odoo,microcom/odoo,laslabs/odoo,microcom/odoo,ygol/odoo,bplancher/odoo,storm-computers/odoo,ygol/odoo,microcom/odoo,bplancher/odoo,hip-odoo/odoo,Elico-Corp/odoo_OCB,ygol/odoo,dfang/odoo,dfang/odoo