fix(form): missinb closing tag

Signed-off-by: Thierry Bugier <tbugier@teclib.com>

inc/form.class.php

@@ -1291,6 +1291,7 @@ public function displayUserForm() {
             echo '<div class="form-group required liste" id="form-validator">';
             echo '<label>' . __('Choose a validator', 'formcreator') . ' <span class="red">*</span></label>';
             Dropdown::showFromArray('formcreator_validator', $validators);
+            echo '</div>';
          }
       }