Qt ui: show open panel on startup (#20859)

* should work

* spaces
old-commit-hash: 95e8c75ebd

selfdrive/ui/qt/offroad/settings.cc

@@ -309,6 +309,7 @@ void SettingsWindow::showEvent(QShowEvent *event) {
   for (auto &[name, panel] : panels) {
     QPushButton *btn = new QPushButton(name);
     btn->setCheckable(true);
+    btn->setChecked(nav_btns->buttons().size() == 0);
     btn->setStyleSheet(R"(
       QPushButton {
         color: grey;