MDL-26684 workshop: fixed missing href attribute in the link to the o…

…wn submission

This was caused by incorrect construction of workshop_submission_summary.
Instead of direct initiation, the helper method should be used. The
helper adds a property 'url' needed to render 'href' later.

mod/workshop/view.php

@@ -409,7 +409,7 @@
         print_collapsible_region_start('', 'workshop-viewlet-ownsubmission', get_string('yoursubmission', 'workshop'));
         echo $output->box_start('generalbox ownsubmission');
         if ($submission = $workshop->get_submission_by_author($USER->id)) {
-            echo $output->render(new workshop_submission_summary($submission, true));
+            echo $output->render($workshop->prepare_submission_summary($submission, true));
         } else {
             echo $output->container(get_string('noyoursubmission', 'workshop'));
         }