Fix bug around transaction requests
Fix bug around transaction requests

If a transaction is already in-flight when a peer announces a new tx to us, we
schedule a time in the future to reconsider whether to download. At that future
time, there was a bug that would prevent transactions from being rescheduled
for potential download again (ie if the transaction was still in-flight at the
time of reconsideration, such as from some other peer). Fix this.

DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin,DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin,DigitalPandacoin/pandacoin,DigitalPandacoin/pandacoin,peercoin/peercoin,peercoin/peercoin