monoblue: tweak branch table's last row's cell colspan on summary page

This table only has 3 columns, so max sensible colspan is 3.

mercurial/templates/monoblue/summary.tmpl

@@ -71,7 +71,7 b''
     <table>
     {branches%branchentry}
         <tr class="light">
-          <td colspan="4"><a class="list" href="{url|urlescape}branches{sessionvars%urlparameter}">...</a></td>
+          <td colspan="3"><a class="list" href="{url|urlescape}branches{sessionvars%urlparameter}">...</a></td>
         </tr>
     </table>
 {footer}