title: Add alternate category thumbnail for refine search
body: <p>Opencart categories out of the box can each have one image associated with it. I would like to have the ability to associate a second image with each category. </p>
  
  <p>The first thing I did was show the category image in the refine search box.</p>
  
  <p>Next I created a thumbnail_image column to the category field in the database. </p>
  
  <p>I am having difficulty getting the new image field to show on the page I have edited the controller and template file to no avail it just shows as an empty box. </p>
  
  <p>Here is a link to the page to hopefully clarify my intentions.</p>
  
  <p><a href="http://sarasotasalonequipment.com/commerce/index.php?route=product/category&amp;path=1" rel="nofollow">http://sarasotasalonequipment.com/commerce/index.php?route=product/category&amp;path=1</a></p>