do not decorate address with .coin param is given

lib/server.js

@@ -1188,6 +1188,7 @@ WalletService.prototype._getUtxosForCurrentWallet = function(opts, cb) {
       });
     },
     function(next) {
+      if (opts.coin) return next();
       // Needed for the clients to sign UTXOs
       var addressToPath = _.indexBy(allAddresses, 'address');
       _.each(allUtxos, function(utxo) {