block: fix timestamp check...again.
block: fix timestamp check...again.

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