Fix order of judgings on submission page.

Found while looking at DOMjudge#2191, see this comment:
DOMjudge#2191 (comment)

Previously, we treated the start time as higher priority indicator than
the judgingId for sorting the rows. For submissions that are queued we
don't have a starttime yet, so they show up first.

Now, the order is purely by judgingid. For one specific submission,
the starttime of judgings should always be in order of their judgingid
so this change should be a no-op otherwise.

webapp/src/Controller/Jury/SubmissionController.php

@@ -217,8 +217,7 @@ public function viewAction(
             ->setParameter('contest', $submission->getContest())
             ->setParameter('submission', $submission)
             ->groupBy('j.judgingid')
-            ->orderBy('j.starttime')
-            ->addOrderBy('j.judgingid')
+            ->orderBy('j.judgingid')
             ->getQuery()
             ->getResult();