Fix broken layout in submission list page.

Submission lists are broken when all testcases in a task are marked
public. This commit fixes the problem.

Author: qnighy

cms/server/templates/contest/task_submissions.html

@@ -205,7 +205,7 @@ <h2 style="margin: 40px 0 10px">{{ _("Previous submissions") }}</h2>
         <col class="time"/>
 {% end %}
         <col class="status"/>
-{% if score_type is not None and score_type.max_public_score != 0 %}
+{% if score_type is not None and score_type.max_public_score != 0 and score_type.max_public_score != score_type.max_score %}
         <col class="public_score"/>
         <col class="total_score"/>
 {% else %}