Posts, Post Types: Multisite: Decrement post_count option value when a post is deleted.
Previously, the post_count option value was not decremented when a post was deleted.
This change moves the _update_posts_count_on_delete action from delete_post hook to after_delete_post to ensure the deletion is taken into account.
Props henry.wright, pbearne, audrasjb.
Fixes #53443.