erp5_xhtml_style: fix login

product/ERP5/bootstrap/erp5_xhtml_style/SkinTemplateItem/portal_skins/erp5_xhtml_style/login_form.zpt

@@ -34,7 +34,6 @@
               <label>&nbsp;</label>
               <div class="input">
                 <input type="submit" value="Login" class="submit"
-                       tal:attributes="name python: '%s:method' % (form_action, )"
                        i18n:attributes="value" i18n:domain="ui" />
               </div>
               <p class="clear"></p>