Use the correct property in the test for the logic to function

This commit modifies the logic to use the correct property of the object
to allow the test to function as expected

To Test:
- locally have a guidance listing page and an ig_guidance page
of the type Panel Guidance and an ig_guidance page of another type (eg external)
- load the guidance listing page
- confirm that there is no label 'Panel Guidance' in the panel guidance page's card
- confirm that the expected label is displayed on the card for the page that has a different type

app/templates/ig_guidance/_partials/guidance.html

@@ -13,8 +13,7 @@
   <div class="nhsuk-promo">
 
     <a href="{{ guidance.url }}" class="nhsuk-promo__link-wrapper">
-
-      {% if guidance.guidance_type != "Panel Guidance" %}
+      {% if guidance.content_type.name != "Panel Guidance" %}
       <span class="nhsai_resource__category">{{ guidance|guidance_type }}</span>
       {% endif %}