Fix tags suggest for bulk edit, for post_type post and taxonomy post_tag....

Fix tags suggest for bulk edit, for post_type post and taxonomy post_tag. Address all non-hierarchical taxonomies in 3.4. fixes #19716, props scottbasgaard.

git-svn-id: https://core.svn.wordpress.org/trunk@19478 1a063a9b-81f0-0310-95a4-ce76da25c4cd