wpa_gui: Use dialog window type

This helps window managers treat the window properly. Mostly tiling WMs
are affected by this. All other windows inherit this option from QDialog
already.

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

wpa_supplicant/wpa_gui-qt4/wpagui.cpp

@@ -36,6 +36,7 @@ WpaGui::WpaGui(QApplication *_app, QWidget *parent, const char *, Qt::WFlags)
 	: QMainWindow(parent), app(_app)
 {
 	setupUi(this);
+	this->setWindowFlags(Qt::Dialog);
 
 #ifdef CONFIG_NATIVE_WINDOWS
 	fileStopServiceAction = new QAction(this);