Cannot get CPT posts to appear in REIGN recent posts widget

Would anyone be able to help me? I have a custom post type, I have put the below code in my functions.php file (via code snippets) and it works fine showing the recent posts in the standard recent post wordpress widget but I cannot get it to show in the REIGN News Widget Latest Posts one. I assume I need to change one of the parameters to point towards using this widget… maybe?

add_filter('widget_posts_args', 'add_custom_post_type_to_recent_posts'); 
function add_custom_post_type_to_recent_posts($params) {   $params['post_type'] = array('post','blog');
   return $params;
}

You can see what I mean looking on the right sidebar on this page https://bellevebricks.co.uk/blog/. The one that says “Recent” at the bottom is me testing that the code I put in works with the default wordpress widget.

The page I need help with: [log in to see the link]