Revert the changes made to `data.title` in playlist Underscore templates in [27869]. `{{ data.title }}` causes the title to be double-encoded on the front end.

See #27574.


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git-svn-id: http://core.svn.wordpress.org/trunk@27790 1a063a9b-81f0-0310-95a4-ce76da25c4cd