fix fetch-stealth.
fix fetch-stealth.

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