core: lock trade mutex for preimage resp. #2973
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closes #2964
I think the only way the cancel can become nil is if we received a notification that we already missed the preimage request and so the cancel is revoked, so it would probably be fine to just error, but I'm unsure this is the only reason cancel would be nil here, so locking the trade mutex until we check the csum seems the safest and most straight forward way to deal with this.