`in Folder` does not seem to work for Zope 2.8

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@40645 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Tool/PropertySheetTool.py

@@ -130,7 +130,7 @@ class PropertySheetTool(BaseTool):
       if name[0] == '_':
         continue
 
-      if name in self.portal_property_sheets:
+      if name in self.portal_property_sheets.objectIds():
         self.portal_property_sheets.deleteContent(name)
         transaction.commit()