[FIX] point_of_sale: pos_payment group on session
[FIX] point_of_sale: pos_payment group on session

TRACEBACK on pos.payment list view > Group By : Sessions
https://pastebin.com/cKESKmP6

session_id was not a stored field.
ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo