Fix typo, do not pass self as argument

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39214 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/mixin/cached_convertable.py

@@ -93,7 +93,7 @@ class CachedConvertableMixin:
   def generateCacheId(self, **kw):
     """
     """
-    return self._getCacheKey(self, **kw)
+    return self._getCacheKey(**kw)
 
   def _getCacheKey(self, **kw):
     """