Remove old show_last_update argument and related code from wp_dropdown_categories
|Reported by:||solarissmoke||Owned by:||duck_|
In wp_dropdown_categories() and the related walker class there is reference to a show_last_update argument which is linked to a last_update_timestamp property for category objects. That property was dropped about 5 years ago ()!
Patch removes these. I haven't bothered adding _deprecated_argument() calls, seeing as setting the argument doesn't actually work (you just get PHP warnings), and hasn't for a really long time.