Fix, for correct compilation with GCC

Author: mxrcode

src/mainwindow.cpp

@@ -1407,7 +1407,7 @@ void MainWindow::create_tray_icon() {
     // About Qt
     QAction *about_qt = tray_menu.addAction("About Qt");
     QObject::connect(about_qt, &QAction::triggered, qApp, [&]() {
-        about_qt_window.show();
+        qt_window.show();
     });
 
     // Separator

src/mainwindow.h

@@ -140,7 +140,7 @@ class MainWindow : public QMainWindow
     QIcon tray_svg = QIcon(":/img/logo-light.svg");
     QSystemTrayIcon *tray_icon = new QSystemTrayIcon(tray_svg, this);
     QMenu tray_menu;
-    about_qt_window about_qt_window;
+    about_qt_window qt_window;
     about_author author_window;
     encryption *encryption_window;