workflow_history is not touched directly, so mark it as changed explicitly

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@17172 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Extensions/CheckPortalTypes.py

@@ -97,5 +97,6 @@ def updateCareerValidationState(self):
       for line in career.workflow_history['career_workflow']:
         if 'state' in line:
           line['validation_state'] = line.pop('state')
+      career.workflow_history._p_changed = 1
       career.reindexObject()