FIX: don't mark first post as approvable (PR #34)

When Site Setting.category experts_posts_require_approval is true - first post should not be automatically approved.

When Site Setting.category experts_posts_require_approval is false - first post should not be marked as approvable.

GitHub

@markvanlan - I made a mistake in the first PR, I think that first post should not even be approvable therefore I moved that check a little bit higher :slight_smile: