Fix in output serializer, arg is seed not bitcount.
Fix in output serializer, arg is seed not bitcount.

tuomassiren/libbitcoin-explorer,libtetcoin/libtetcoin-explorer,libmetrocoin/libmetrocoin-explorer,cancoin/libbitcoin-explorer,GroestlCoin/libgroestlcoin-explorer,GroestlCoin/libgroestlcoin-explorer,tuomassiren/libbitcoin-explorer,GroestlCoin/libgroestlcoin-explorer,libmetrocoin/libmetrocoin-explorer,cancoin/libbitcoin-explorer,libtetcoin/libtetcoin-explorer