Remove unneeded $form['#attributes']['novalidate'] that breaks client side validation in forms

Closes #3441652

added 1 commit

• 5cd542ee - Made element visually-hidden. Needed when signature field is required. When...

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I have removed the class 'hidden' from the CSS. This is not needed because Drupal has CSS hidden classes build-in. See core/modules/system/css/components/hidden.module.css