fix fullscreen map on startup

selfdrive/ui/qt/onroad.cc

@@ -82,8 +82,9 @@ void OnroadWindow::offroadTransition(bool offroad) {
       settings.setAccessToken(token.trimmed());
 
       MapWindow * m = new MapWindow(settings);
+      m->setFixedWidth(width() / 2 - bdr_s);
       QObject::connect(this, &OnroadWindow::offroadTransitionSignal, m, &MapWindow::offroadTransition);
-      split->addWidget(m);
+      split->addWidget(m, 0, Qt::AlignRight);
       map = m;
     }
   }