networks: enable segwit by default for main.
networks: enable segwit by default for main.

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