qt: Add ability to open screenshots folder

src/qt/qt_mainwindow.hpp

@@ -129,6 +129,8 @@ protected:
 private slots:
     void on_actionShow_non_primary_monitors_triggered();
 
+	void on_actionOpen_screenshots_folder_triggered();
+
 private:
     Ui::MainWindow *ui;
     std::unique_ptr<MachineStatus> status;