map: set destination marker visibility once (#29444)

set visibility once

selfdrive/ui/qt/maps/map.cc

@@ -377,8 +377,6 @@ void MapWindow::offroadTransition(bool offroad) {
 }
 
 void MapWindow::updateDestinationMarker() {
-  m_map->setPaintProperty("pinLayer", "visibility", "none");
-
   auto nav_dest = coordinate_from_param("NavDestination");
   if (nav_dest.has_value()) {
     auto point = coordinate_to_collection(*nav_dest);
@@ -388,5 +386,7 @@ void MapWindow::updateDestinationMarker() {
     pinSource["data"] = QVariant::fromValue<QMapbox::Feature>(feature);
     m_map->updateSource("pinSource", pinSource);
     m_map->setPaintProperty("pinLayer", "visibility", "visible");
+  } else {
+    m_map->setPaintProperty("pinLayer", "visibility", "none");
   }
 }