Don't override filtered screen options on Widgets screen. props bradyvercher. fixes #23239.

git-svn-id: http://core.svn.wordpress.org/trunk@23503 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Improved logged out warnings, first run, props mintindeed, see #23295

git-svn-id: http://core.svn.wordpress.org/trunk@23504 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Logged out warnings: remove debug leftovers, see #23295

git-svn-id: http://core.svn.wordpress.org/trunk@23505 1a063a9b-81f0-0310-95a4-ce76da25c4cd