Fix expression used to generate - or not - the enctype parameter on form tag.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@10100 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_xhtml_style/bt/revision

-202
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+203
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