Fix gallery template

apps/course/templates/course/content/gallery.html

@@ -20,7 +20,8 @@
     <a href="{{ image.img.image.url }}">
       {% thumbnail image.img.image "140x140" crop="center" as im %}
       <img class="examples__pic" src="{{ im.url }}" width="{{ im.width }}" height="{{ im.height }}">
-      {% endthumbnail %}    </a>
+      {% endthumbnail %}
+    </a>
   </div>
   {% endfor %}
 </div>