add missing libwallet:: namespace qualifier.
add missing libwallet:: namespace qualifier.

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