This makes the trade service restore the watch for accepted trades and locked utxos.
NOTE: if a trade is already expired, the service doesn't update it's status immediately and releases the lock of the utxos, but it waits for a minute before doing that. This to give the time to the bc listener to eventually be notified about a settled trade so that it can correctly update its status and spend the utxos instead.
This makes the trade service restore the watch for accepted trades and locked utxos.
NOTE: if a trade is already expired, the service doesn't update it's status immediately and releases the lock of the utxos, but it waits for a minute before doing that. This to give the time to the bc listener to eventually be notified about a settled trade so that it can correctly update its status and spend the utxos instead.
Closes #564.
Please @tiero review this.