ERP5Workflow: in a folder, state should be searched by reference not by id

if using id, it would check for simulation state to be for example in state_draft (id)
instead of draft (reference)
This was breaking testFunctionalCore page_templates_zuite/testSearchDialog

product/ERP5Form/Extensions/Folder_viewSearchDialog.py

@@ -340,7 +340,7 @@ def getSearchDialog(self, REQUEST=None):
       field.manage_edit_xmlrpc(dict(
           form_id='Base_viewDialogFieldLibrary',
           field_id='your_category_list'))
-      items = sorted([(translateString(state.title), state.id) for state in state_list],
+      items = sorted([(translateString(state.title), state.getReference()) for state in state_list],
                      key=lambda state:str(state[0]))
       field._surcharged_edit(
               dict(title=translateString(workflow.title),