Cassio: modify portfolio post type capabilities

<?php

add_filter( 'register_post_type_args', 'modify_arts_portfolio_item_args', 10, 2 );
function modify_arts_portfolio_item_args( $args, $post_type ) {
  if ( 'arts_portfolio_item' === $post_type ) {
    $args['has_archive'] = true; // Enable archive page
  }

  return $args;
}