ui: Don't show start window when opening project with double-click

* added menu option to show start window

src/lib_gui/qt/window/QtStartScreen.h

@@ -34,7 +34,7 @@ public:
 	QtStartScreen(QWidget* parent = 0);
 	QSize sizeHint() const override;
 
-	void setupStartScreen(bool unlocked);
+	void setupStartScreen();
 
 signals:
 	void openOpenProjectDialog();