ui: fix navigation update

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.52.1",
+  "version": "4.52.2",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "index.ts",

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

@@ -275,7 +275,7 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
           if (isValidOption(val)) $(`.objective_${id}.radiobox [value="${val}"]`).prop('checked', true);
         }
       }
-      setUpdate((v) => v + 1);
+      setUpdate?.((v) => v + 1);
     }
 
     if (cnt) {