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>
\ No newline at end of file

bt5/erp5_interface_post/bt/template_portal_type_property_sheet_list

-Internet Message Post | InterfacePost
-Letter Post | InterfacePost
\ No newline at end of file
+Internet Message Post | Data
+Letter Post | Data
\ No newline at end of file