fix: initialization of problem title while editing

client/pages/ProblemPage.tsx

@@ -54,6 +54,11 @@ export const ProblemPage = ({ id }: RouteProps) => {
     const [editing, setEditing] = useState<boolean>(false)
     const [modifiedProblemSource, setModifiedProblemSource] = useState<string>('')
     const [modifiedProblemTitle, setModifiedProblemTitle] = useState<string>(problem?.title ?? '')
+    useEffect(() => {
+        if (problem) {
+            setModifiedProblemTitle(problem.title)
+        }
+    }, [problem?.title])
 
     useEffect(() => {
         if (problem) {