txdb: fix verify for orphans.
txdb: fix verify for orphans.

decentraland/decentraland-node,decentraland/bronzeage-node,VidaID/bcoin,VidaID/bcoin,decentraland/bronzeage-node,decentraland/decentraland-node,decentraland/decentraland-node,VidaID/bcoin,decentraland/bronzeage-node