ui: fix pagination qs

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.37.4",
+  "version": "4.37.5",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/templates/partials/problem_list.html

@@ -73,6 +73,6 @@
     {%- endfor -%}
     </tbody>
   </table>
-  {{ paginator.render(page, ppcount, add_qs=qs) }}
+  {{ paginator.render(page, ppcount, add_qs=('q=' + qs if qs else '')) }}
 {% endif %}
 </div>