Added just another missing libwallet:: namespace qualifier.
Added just another missing libwallet:: namespace qualifier.

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