Fix migration to portal types as classes when it is not triggered by activity tool

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@45287 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/dynamic/portal_type_class.py

@@ -365,6 +365,7 @@ def synchronizeDynamicModules(context, force=False):
         from Products.ERP5Type.dynamic.persistent_migration import PickleUpdater
         if PickleUpdater.get:
           portal.migrateToPortalTypeClass()
+        portal.portal_skins.changeSkin(None)
         LOG('ERP5Site', INFO, 'Transition successful, please update your'
             ' business templates')