go: Fix cross test server

Client: go

This was a bug introduced by 91565d4
that broke go's cross-test server, but because other CI issues we didn't
run cross-test so we didn't notice the issue.

test/go/src/common/server.go

@@ -49,7 +49,7 @@ func GetServerParams(
 ) (thrift.TProcessor, thrift.TServerTransport, thrift.TTransportFactory, thrift.TProtocolFactory, string /* addr */, error) {
 
 	var err error
-	hostPort := fmt.Sprintf("%s:0", host)
+	hostPort := fmt.Sprintf("%s:%d", host, port)
 	var cfg *thrift.TConfiguration = nil
 
 	var protocolFactory thrift.TProtocolFactory