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].

Built from https://develop.svn.wordpress.org/trunk@28593


git-svn-id: http://core.svn.wordpress.org/trunk@28418 1a063a9b-81f0-0310-95a4-ce76da25c4cd