Gui: move to new style connect()

src/Gui/MDIView.cpp

@@ -264,8 +264,8 @@ void MDIView::printPreview()
 {
     QPrinter printer(QPrinter::ScreenResolution);
     QPrintPreviewDialog dlg(&printer, this);
-    connect(&dlg, SIGNAL(paintRequested (QPrinter *)),
-            this, SLOT(print(QPrinter *)));
+    connect(&dlg, &QPrintPreviewDialog::paintRequested,
+            this, qOverload<QPrinter*>(&MDIView::print));
     dlg.exec();
 }