users are not supposed to add knowledge pad in preferences directly

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33866 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_knowledge_pad/PortalTypeHiddenContentTypeTemplateItem/hidden_content_type_list.xml

+<hidden_content_type_list>
+ <portal_type id="Preference">
+  <item>Knowledge Pad</item>
+ </portal_type>
+</hidden_content_type_list>
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bt5/erp5_knowledge_pad/bt/revision

-492
+494
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bt5/erp5_knowledge_pad/bt/template_portal_type_hidden_content_type_list

+Preference | Knowledge Pad
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