erp5_wendelin: Update Data Supply definition (mixin)

   Use proper way of configure Mixin on portal types

bt5/erp5_wendelin/PortalTypeTemplateItem/portal_types/Data%20Supply.xml

@@ -58,14 +58,6 @@ It is used by Ingestion Policy.</string> </value>
               <tuple/>
             </value>
         </item>
-        <item>
-            <key> <string>type_mixin</string> </key>
-            <value>
-              <tuple>
-                <string>CompositionMixin</string>
-              </tuple>
-            </value>
-        </item>
       </dictionary>
     </pickle>
   </record>

bt5/erp5_wendelin/PortalTypeTypeMixinTemplateItem/type_mixin.xml

+<type_mixin>
+ <portal_type id="Data Supply">
+  <item>CompositionMixin</item>
+ </portal_type>
+</type_mixin>
\ No newline at end of file