Remove theme tags from the themes.php UI. They just take up room and are...

Remove theme tags from the themes.php UI. They just take up room and are redundant with the feature filter. The installer already does not show tags. props DH-Shredder, fixes #20147.

git-svn-id: https://core.svn.wordpress.org/trunk@20065 1a063a9b-81f0-0310-95a4-ce76da25c4cd