@PieterGoosen is cool, and still awake like me and answering like boss.
To simplify his code and make it work to this specifically without a bunch of junk on your page:
/**
* Pieter Goosen writes awesome code
*/
add_filter( 'register_post_type_args', 'change_capabilities_of_the_custom_css_js_posttype' , 10, 2 );
function change_capabilities_of_the_custom_css_js_posttype( $args, $post_type ){
// Do not filter any other post type
if ( 'custom-css-js' !== $post_type ) {
// Give other post_types their original arguments
return $args;
}
// Change the capability_type of the "custom-css-js" post_type
$args['capability_type'] = 'manage_options';
// Give the custom-css-js post type it's arguments
return $args;
}
The plugin you have chosen is written in a broad way. It has some insecurities.