Radio buttons should be disabled until the choice is reverted

[pavelsokolov]

Right now after the choice is made, radio buttons are still clickable, though you have to revert your choice before being able to save a new one. They should be disabled.

renderer.php:142

        // Disable updates until the choice is reset
        if (!$multipleenrollmentspossible && !empty($options['allowupdate']) && ($options['allowupdate'])) {
            $attributes['disabled'] = true;
        }