Remove old show_last_update/include_last_update_time/show_date code from...

Remove old show_last_update/include_last_update_time/show_date code from category template functions. Props solarissmoke. Fixes #19953.


git-svn-id: https://core.svn.wordpress.org/trunk@19927 1a063a9b-81f0-0310-95a4-ce76da25c4cd