Setting DragonX default theme for additional exception

src/mainwindow.cpp

@@ -2351,7 +2351,12 @@ void MainWindow::slot_change_theme(QString& theme_name)
        saved_theme_name = Settings::getInstance()->get_theme_name();
     } catch (const std::exception& e) {
         qDebug() << QString("Ignoring theme change Exception! : ");
-        saved_theme_name = "dark";
+
+        if(isdragonx){
+            saved_theme_name = "dragonx";
+        }else{
+            saved_theme_name = "dark";
+        }
     }
 
     QString filename = ":/css/" + saved_theme_name +".css";