[FIX] point_of_sale: reduce orders to sync in cross-orders

With the cross-orders feature, whenever the PoS have to sync with
the server, it send to the servers the orders that have changed
since the last sync. The problem is that we added to this set all
the orders that we loaded from the server even if they didn't change
between the two sync. We fix this here.

closes odoo/odoo#119929

X-original-commit: 4ba8699b95325480c9ebfc0ca3c8a2433b15b87a
Signed-off-by: Monnom David (moda) <moda@odoo.com>

addons/point_of_sale/static/src/js/models.js

@@ -450,7 +450,7 @@ export class PosGlobalState extends PosModel {
     }
     _onReactiveOrderUpdated(order) {
         order.save_to_db();
-        if (this.isOpenOrderShareable()) {
+        if (this.isOpenOrderShareable() && !this.loadingOrderState) {
             this.ordersToUpdateSet.add(order);
         }
     }