Flush content so page display quicker

MythFrontend::findFrontends() may take a very long time to return. So flush any content.

Partially Fixes #11051

Author: jyavenard

modules/tv/tmpl/default/detail.php

@@ -853,6 +853,7 @@ function updateHomePage(item) {
             </div>
 
         <?php
+            flush();
             $frontends = MythFrontend::findFrontends();
             if (is_array($frontends)) {
                 echo '<div class="x-frontends">'.t('Play Recording on Frontend').':<ul>';