pdm: do not acquire variation from order and specialise

We might get variation from a transformation on a delivery line, which is not good

bt5/erp5_pdm/CategoryTemplateItem/portal_categories/variation.xml

@@ -14,8 +14,6 @@
             <key> <string>acquisition_base_category</string> </key>
             <value>
               <tuple>
-                <string>specialise</string>
-                <string>order</string>
                 <string>parent</string>
               </tuple>
             </value>