Issue 6769 - Avoid hardcoding the URL

pages/filters/object-subrequest.tmpl

 title = $object-subrequest
 template = testcase
 
 {% set testcase_moreinfo = [
   ("Filter Options", "https://adblockplus.org/filters#options"),
 ] %}
 
 <section class="site-panel">
   <h2>$object-subrequest</h2>
   <p>Check that usage of the $object-subrequest 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 and image should not be blocked, but the request from the object/swf file should be.</p>
 </section>
 
 <section class="site-panel">
   <h2>Test case</h2>
   <div class="testcase-container">
     <div class="testcase-row">
       <h3>Object Subrequest</h3>
       <object data="/testcasefiles/objectsubrequest/objectsubrequest.swf" type="application/x-shockwave-flash" style="width: 250px; height: 250px;"></object>
     </div>
     <div class="testcase-row">
       <h3>Image</h3>
       <img class="testcase-image" src="/testcasefiles/objectsubrequest/image.jpg"/>
     </div>
   </div>
   <h3>Filters</h3>
-  <pre>testpages.adblockplus.org/testcasefiles/objectsubrequest/$object-subrequest</pre>
-</section>
+  <pre>{{ site_url|strip_proto }}/testcasefiles/objectsubrequest/$object-subrequest</pre>
+</section>