erp5_interface_post: real property sheet for Posts is Data

bt5/erp5_interface_post/PortalTypePropertySheetTemplateItem/property_sheet_list.xml

 <property_sheet_list>
  <portal_type id="Internet Message Post">
-  <item>InterfacePost</item>
+  <item>Data</item>
  </portal_type>
  <portal_type id="Letter Post">
-  <item>InterfacePost</item>
+  <item>Data</item>
  </portal_type>
 </property_sheet_list>
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bt5/erp5_interface_post/bt/template_portal_type_property_sheet_list

-Internet Message Post | InterfacePost
-Letter Post | InterfacePost
+Internet Message Post | Data
+Letter Post | Data
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