[REF] website_sale: make better xpath to split /shop layout
[REF] website_sale: make better xpath to split /shop layout

Part of https://github.com/odoo/odoo/pull/31147
task-1925327
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo