allow woocommerce product bundle type in upsell

allow woocommerce product bundle type in upsell

add_filter(
    'wfocu_offer_product_types',
    function ( $types ) {
        // Only expose bundles when WooCommerce Product Bundles is actually active.
        if ( class_exists( 'WC_Product_Bundle' ) && ! in_array( 'bundle', (array) $types, true ) ) {
            $types[] = 'bundle';
        }
        return $types;
    }
);