Work around crashes when visting overworld twice. However I'm pretty sure this 'fix' causes a leak

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@10773 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/tracks/track.cpp

@@ -831,7 +831,8 @@ bool Track::loadMainTrack(const XMLNode &root)
 
             convertTrackToBullet(scene_node);
             scene_node->remove();
-            
+            irr_driver->grabAllTextures(original_mesh);
+
             scene::IMesh* mesh = manip->createMeshWithTangents(original_mesh);
             mesh->grab();
             irr_driver->grabAllTextures(mesh);