Issue 6769 - Avoid hardcoding the URL

pages/filters/object.tmpl

 title = $object
 template = testcase
 
 {% set testcase_moreinfo = [
   ("Filter Options", "https://adblockplus.org/filters#options"),
 ] %}
 
 <section class="site-panel">
   <h2>$object</h2>
   <p>Check that usage of the $object filter option works as expected.</p>
   <p>With the filter displayed below each test case added to ABP (or with the testcase subscription installed and active), the object/swf file in the test case panel should be blocked but the image should not.</p>
 </section>
 
 <section class="site-panel">
   <h2>Test case</h2>
   <p>The object should be blocked. The image should not be blocked.</p>
   <div class="testcase-container">
     <div class="testcase-row">
       <h3>Object</h3><object data="/testcasefiles/object/object.swf" type="application/x-shockwave-flash" class="trap" style="width: 250px; height: 250px;"></object>
     </div>
     <div class="testcase-row">
       <h3>Image</h3>
       <img class="testcase-image" src="/testcasefiles/object/image.jpg"/>
     </div>
   </div>
   <h3>Filters</h3>
-  <pre>testpages.adblockplus.org/testcasefiles/object/$object</pre>
+  <pre>{{ site_url|strip_proto }}/testcasefiles/object/$object</pre>
 </section>