Remove key mangling code from get_the_author_meta(). Make it more inline with...

Remove key mangling code from get_the_author_meta(). Make it more inline with get_user_option(). Handle collision with old users table columns that are on old schema, particularly user_description.

Props scribu, fredwu.
Fixes #20285


git-svn-id: https://core.svn.wordpress.org/trunk@20565 1a063a9b-81f0-0310-95a4-ce76da25c4cd