nav: Only recompute when onroad (#21797)

selfdrive/ui/qt/maps/map.cc

@@ -259,6 +259,10 @@ static float get_time_typical(const QGeoRouteSegment &segment) {
 
 
 void MapWindow::recomputeRoute() {
+  if (!QUIState::ui_state.scene.started) {
+    return;
+  }
+
   // Retry all timed out requests
   if (!m_map.isNull()) {
     m_map->connectionEstablished();