fixed sound being faint after playing a game

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@3443 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/gui/state_manager.cpp

@@ -582,6 +582,7 @@ namespace StateManager
         g_menu_stack.clear();
         g_menu_stack.push_back(name);
         g_game_mode = false;
+        sound_manager->positionListener( Vec3(0,0,0), Vec3(0,1,0) );
         GUIEngine::switchToScreen(name.c_str());
         eventCallback(NULL, g_init_event);
     }