Filter taxonomies by 'show_ui' instead of 'public'

[DGStefan]

https://www.admincolumns.com/forums/topic/filter-taxonomies-by-show_ui-instead-of-public/

Currently within CPAC#get_taxonomies() you are including taxonomies that have ‘public’ set to true. I think it would be better if you included taxonomies based on their ‘show_ui’ setting, since those taxonomies are the ones that will have admin screens in wp-admin and thus should be customizable.

codepress-admin-columns.php#403