title: WordPress Taxonomy - OrderBy issue
body: <p>I have the following query in WordPress. I'm trying to get all my posts from a specific taxonomy and order BY <strong>title</strong>. It gets the posts great but orders by date(??).</p>
  
  <p>Here's the query:</p>
  
  <pre><code>$the_query = new WP_Query(array(
      'post_type' =&gt; 'faces',
      'posts_per_page' =&gt; -1,
      'tax_query' =&gt;  array (
          array(
              'taxonomy' =&gt; 'faces-page',
              'terms' =&gt; array(25, 29, 30),
              'field' =&gt; 'id',
              'orderby' =&gt; 'title',
              'order' =&gt; 'DESC',
              'operator' =&gt; 'NOT IN',
          ),
      ),
   ));
  </code></pre>
  
  <p>Can anyone advise why when I run <code>var_dump($the_query-&gt;request);</code> immediately after this code, my output is the following (see ORDER BY):</p>
  
  <pre><code>    SELECT wcolp_posts.* 
  FROM   wcolp_posts 
  WHERE  1 = 1 
         AND ( wcolp_posts.id NOT IN (SELECT object_id 
                                      FROM   wcolp_term_relationships 
                                      WHERE  term_taxonomy_id IN ( 25, 29, 30 )) ) 
         AND wcolp_posts.post_type = 'faces' 
         AND ( wcolp_posts.post_status = 'publish' 
                OR wcolp_posts.post_status = 'acf-disabled' 
                OR wcolp_posts.post_status = 'private' ) 
  GROUP  BY wcolp_posts.id 
  ORDER  BY wcolp_posts.post_date DESC 
  </code></pre>
  
  <p>Surely it should be order by title, not date? Help please :-)</p>