allow clean in draft to make it possible to build from draft state.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28537 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/business_template_building_workflow.xml

@@ -648,6 +648,7 @@
               <tuple>
                 <string>build</string>
                 <string>build_action</string>
+                <string>clean</string>
                 <string>edit</string>
               </tuple>
             </value>