Manually delete fixture in `test_mysqli_flush_sync()`.

This test creates a dummy post and subsequently runs a query containing
`DROP PROCEDURE`. This latter query implies a `COMMIT`, which means that the
post is not cleaned up for later tests. Manually deleting the post with
`wp_delete_post()` solves this problem.

Fixes #28155.
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Twenty Fifteen: reduce the margins on the editor body in esitor-style.css. Fixes #30331.
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Introduce `$post_type` param for `count_user_posts()`.

Props Caspie, engelen, DrewAPicture.
Fixes #21364.
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Pass query object to 'the_post' filter.

Props tlovett1.
Fixes #30327.
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Twenty Fifteen: unfix the sidebar if we have a menu with submenus as there is a chance visitors might not be able to scroll down to see submenus in some situations.

Props mattwiebe, fixes #30208.


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Twenty Fifteen: cleaning up JS introduced in r30305 that doesn't pass jshint.

Props boonebgorges, fixes #29988.


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