fix bad copy paste

synergine2_cocos2d/gui.py

 from synergine2_cocos2d.interaction import InteractionManager
 from synergine2_cocos2d.layer import LayerManager
 from synergine2_cocos2d.middleware import TMXMiddleware
-from synergine2_cocos2d.middleware import TMXMiddlewareMapMiddleware
+from synergine2_cocos2d.middleware import MapMiddleware
 from synergine2_cocos2d.user_action import UserAction