This method is looking for editable fields in field library forms, it's not
limited to the form containing listbox, it was already used for display but not
for validation, so this was partially working.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38106 20353a03-c40f-0410-a6d1-a30d3c3de9de