[FIX] pos*: Fix order removal

pos*: point_of_sale, pos_restaurant

When deleting an order, the restaurant override of the deletion function
in `point_of_sale` interferes with the logic in such a way that we end up
writing the order that needs to be deleted 2 times.

This is obviously not the expected bahaviour. In this PR we remove
the `override` from `pos_restaurant`, as it is no longer needed and
we also add a mechanism that ensures that orders cannot be duplicated.

closes odoo/odoo#126442

Task: 3383043
Signed-off-by: Adrien Guilliams (adgu) <adgu@odoo.com>

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

@@ -688,11 +688,13 @@ export class PosDB {
      * @param {object} order object.
      */
     set_order_to_remove_from_server(order) {
-        if (order.server_id !== undefined) {
-            var to_remove = this.load("unpaid_orders_to_remove", []);
-            to_remove.push(order.server_id);
-            this.save("unpaid_orders_to_remove", to_remove);
+        if (order.server_id === undefined) {
+            return;
         }
+        const to_remove = new Set(
+            [this.load("unpaid_orders_to_remove", []), order.server_id].flat()
+        );
+        this.save("unpaid_orders_to_remove", [...to_remove]);
     }
     /**
      * Get a list of server_ids of orders to be removed.

addons/pos_restaurant/static/src/js/Screens/TicketScreen.js

@@ -70,19 +70,6 @@ patch(TicketScreen.prototype, "pos_restaurant.TicketScreen", {
             }
         }
     },
-    //@override
-    async onDeleteOrder(order) {
-        const _super = this._super;
-        if (this.pos.config.module_pos_restaurant) {
-            this.pos.setOrderToRemove(order);
-            await _super(...arguments);
-            if (!this.pos.table) {
-                await this.pos._removeOrdersFromServer();
-            }
-        } else {
-            await _super(...arguments);
-        }
-    },
     async setTip(order, serverId, amount) {
         try {
             const paymentline = order.get_paymentlines()[0];