Fix stuck packet cancel

[redbull2905]

Since the official update, the undo package has been changed and I've seen quite a few people trying to sell this fix for 15€ even though it takes 3 seconds. So here is Zanou's patch.

Go to StaticPacketHandler and edit

public static string Cancel(byte type = 0, long callerId = 0) => $"cancel {type} {callerId}";

by

public static string Cancel(byte type = 0, long callerId = 0) => $"cancel {type} {callerId} -1";