_future_post_hook should not call _deprecated_argument()

[nacin]

wp_transition_post_status() passes $post->ID to all "${new_status}_$post->post_type" actions, which _future_post_hook chokes on.

Because the _deprecated_argument() error that is triggered blocks headers from being sent, this really screws up the ability to schedule a future post.

This argument was never used by _future_post_hook, but we should just leave it in anyway and mark it with a comment.

[westi]

(In [12679]) _future_post_hook should not call _deprecated_argument() as it will always get that argument from the action it is hooked to. Fixes #11815 props nacin.