Revert [26012] for now, which had fixed using `paged` with `offset` in WP_Query but introduced side effects for those working around it.

see #18897.

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Add a `wp-video` class to the `div` that wraps video shortcode output. It was previously hard to target.

Props nofearinc.
Fixes #25896.


Built from https://develop.svn.wordpress.org/trunk@26526


git-svn-id: http://core.svn.wordpress.org/trunk@26419 1a063a9b-81f0-0310-95a4-ce76da25c4cd