Windows: Fix warning about setting unsupported clipboard type

Fixes following Qt warning.

    QtWarning: Data set on unsupported clipboard mode. QMimeData object will be deleted. (:0, )

Signed-off-by: Lukas Holecek <hluk@email.cz>

src/gui/mainwindow.cpp

@@ -2701,7 +2701,9 @@ void MainWindow::previousTab()
 void MainWindow::setClipboard(const QVariantMap &data)
 {
     setClipboard(data, ClipboardMode::Clipboard);
+#ifdef HAS_MOUSE_SELECTIONS
     setClipboard(data, ClipboardMode::Selection);
+#endif
 }
 
 void MainWindow::setClipboard(const QVariantMap &data, ClipboardMode mode)