Fix redundant use of array_keys() around get_post_format_slugs().

props SergeyBirkukov, wonderboymusic. fixes #24089.

git-svn-id: http://core.svn.wordpress.org/trunk@24082 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Fix issue with [embed] in post_format_compat.

props kovshenin. fixes #24070.

git-svn-id: http://core.svn.wordpress.org/trunk@24083 1a063a9b-81f0-0310-95a4-ce76da25c4cd