ui: fix problem-sidebar__download

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.37.8",
+  "version": "4.37.9",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/pages/problem_detail.page.jsx

@@ -272,7 +272,7 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
     $(ev.currentTarget).hide();
     $('span.tags').css('display', 'inline-block');
   });
-  $('[name="problem-sidebar__download').on('click', handleClickDownloadProblem);
+  $('[name="problem-sidebar__download"]').on('click', handleClickDownloadProblem);
   if (UiContext.pdoc.config?.type === 'objective') loadObjective();
   if (pagename !== 'contest_detail_problem') initChart();
 });