Changes user_can_richedit() to default to true for logged out users, same as...

Changes user_can_richedit() to default to true for logged out users, same as the default for logged in users, fixes #19320

git-svn-id: https://core.svn.wordpress.org/trunk@19432 1a063a9b-81f0-0310-95a4-ce76da25c4cd