[FIX] point_of_sale: Flush order not null date order

The field date_order cas removed in a previous commit.
Thus, this line needs to be removed as well.

closes odoo/odoo#133654

Related: odoo/enterprise#46580
Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>

addons/point_of_sale/static/src/app/store/pos_store.js

@@ -1089,7 +1089,6 @@ export class PosStore extends Reactive {
             } else {
                 for (const order of orders) {
                     const reactiveOrder = this.orders.find((o) => o.uid === order.id);
-                    reactiveOrder.date_order = null;
                     reactiveOrder.finalized = false;
                     this.db.remove_order(reactiveOrder.uid);
                     this.db.save_unpaid_order(reactiveOrder);