[site-reviews] make 5 the default rating value

/**
 * Make the rating field default to 5 stars
 * @param array $fields
 * @return array
 */
add_filter('site-reviews/config/forms/review-form', function ($fields) {
    if (isset($fields['rating'])) {
        $fields['rating']['value'] = 5;
    }
    return $fields;
});