Fix: Customers with no discount wouldn't show properly in sale / select customer

bookie/src/app/customers/customer-list/customer-list.component.ts

@@ -21,6 +21,7 @@ export class CustomerListComponent implements OnInit {
   ngOnInit() {
     this.route.data.subscribe((value) => {
       const data = value as { list: Customer[] };
+      data.list.forEach((c) => (c.discounts = c.discounts.filter((d) => d.discount !== 0)));
       this.list = data.list;
     });
     this.dataSource = new CustomerListDatasource(this.list);