Fixes the error (400 Bad Response) when cancelling an order

src/Services/Ordering/Ordering.API/Application/DomainEventHandlers/OrderCancelled/OrderCancelledDomainEventHandler.cs

@@ -28,6 +28,7 @@ namespace Ordering.API.Application.DomainEventHandlers.OrderCancelled
             _orderRepository = orderRepository ?? throw new ArgumentNullException(nameof(orderRepository));
             _logger = logger ?? throw new ArgumentNullException(nameof(logger));
             _buyerRepository = buyerRepository ?? throw new ArgumentNullException(nameof(buyerRepository));
+            _orderingIntegrationEventService = orderingIntegrationEventService;
         }
 
         public async Task Handle(OrderCancelledDomainEvent orderCancelledDomainEvent, CancellationToken cancellationToken)