For YouTube playlist oEmbed, we need keep BC for `wp_oembed_remove_provider()` by not changing the existing YouTube endpoint keys. So, rather than merging the rules, the playlist endpoints should be on their own line.

Props kovshenin.

See #28125, [28552].


git-svn-id: https://develop.svn.wordpress.org/trunk@28593 602fd350-edb4-49c9-b593-d223f7449a82