Update markup to use pat-inlinevalidation.

The old legacy JS code looked for the *z3cformInlineValidation* class. Instead we now have a mockup pattern *pat-inlinevalidation*.

See Products.CMFPlone issues https://github.com/plone/Products.CMFPlone/issues/282 and https://github.com/plone/Products.CMFPlone/issues/299

Ping @vangheem