Confusing error message when trying to cancel order that has already been cancelled

[knocte]

Describe the bug If you cancel an order (it's cancelled successfully) and you try to cancel it again, the bot replies "This order cannot be cancelled at this moment", which is a bit confusing. It should rather reply "This order has already been cancelled".

To Reproduce Steps to reproduce the behavior:

1. Put up an order.
2. Do /cancelall
3. Do /cancel <orderId>

Current behaviour It says "This order cannot be cancelled at this moment"

Expected behavior It should say "The order has already been cancelled"