FIxed bug of generating bad native py module skeletons

[swigger]

I recently developed a native python module and found pycharm faield to generate the good sketelon for it. However, it can handle classmethod well. I addressed the problem and found its an issue in module_redecalarator.py. So I created the pull request here. the code here has the same bug as pycharm, hope pycharm is using code from here.