remove auctions sorting options from Woo sort menu

add_filter( 'woocommerce_catalog_orderby', 'custom_woocommerce_catalog_orderby', 99);
function custom_woocommerce_catalog_orderby($data){
    unset($data['bid_asc']);
    unset($data['bid_desc']);
    unset($data['auction_end']);
    unset($data['auction_started']);
    unset($data['auction_activity']);
    return $data;
}