Report server in error when saving wallet as part of rescan

src/mainwindow.cpp

@@ -245,7 +245,7 @@ MainWindow::MainWindow(QWidget *parent) :
 
         if (parsed.isEmpty() || parsed["result"].isNull()) {
             QMessageBox::warning(this, tr("Failed to save wallet"),
-                tr("Couldn't save the wallet") + "\n" + reply,
+                tr("Couldn't save the wallet") + "\n" + "server=" + config->server + "\n" + reply,
                 QMessageBox::Ok);
 
         } else {