Workaround for issue where sometimes an AT stays in "TRADING" mode even after it is marked as finished. This caused Bob's tradebot to enter BOB_REFUNDED mode instead of redeeming the LTC. This workaround treats "TRADING" as "REDEEMED" as long as the AT is finished. It will still enter the BOB_REFUNDED state if the AT's trade state is "REFUNDED" or "CANCELLED", to prevent it trying to redeem LTC without the secret. Longer term we need to prevent the AT itself from getting in this state to begin with, but this should at least solve the LTC redemption problem that occurs as a result.