Amended the display of pages list in naviagtion.html

Adjusted the reference of files to correct case

templates/partials/navigation.html

@@ -8,7 +8,7 @@
       {% endfor %}
 
       {% if DISPLAY_PAGES_ON_MENU %}
-          {% for p in PAGES %}
+          {% for p in pages %}
               <li{% if p == page %} class="nav-{{p.slug}} active"{% endif %} role="presentation"><a href="{{ SITEURL }}/{{ p.url }}">{{ p.title }}</a></li>
           {% endfor %}
       {% else %}