Fixed add-ons being left out when reloading after a resolution switch

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8672 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/graphics/irr_driver.cpp

@@ -416,6 +416,9 @@ void IrrDriver::applyResolutionSettings()
     
     file_manager->popTextureSearchPath();
 
+#ifdef ADDONS_MANAGER
+    KartPropertiesManager::addKartSearchDir(file_manager->getAddonsFile("karts"));
+#endif
     kart_properties_manager -> loadAllKarts();
     
     attachment_manager      -> loadModels();