Fix CategoryFieldListFilter deprecation warnings
Fix CategoryFieldListFilter deprecation warnings

matthiask/feincms2-content,feincms/feincms,matthiask/feincms2-content,joshuajonah/feincms,mjl/feincms,joshuajonah/feincms,matthiask/django-content-editor,mjl/feincms,matthiask/feincms2-content,matthiask/django-content-editor,joshuajonah/feincms,feincms/feincms,matthiask/django-content-editor,joshuajonah/feincms,feincms/feincms,mjl/feincms,matthiask/django-content-editor