Fix isSupervisior async.

modules/contest.js

@@ -234,7 +234,7 @@ app.get('/contest/:id/ranklist', async (req, res) => {
     if (!contest) throw new ErrorMessage('无此比赛。');
     if ([contest.allowedSeeingResult() && contest.allowedSeeingOthers(),
     contest.isEnded(),
-    contest.isSupervisior(curUser)].every(x => !x))
+    await contest.isSupervisior(curUser)].every(x => !x))
       throw new ErrorMessage('您没有权限进行此操作。');
 
     await contest.loadRelationships();

modules/submission.js

@@ -54,7 +54,7 @@ app.get('/submissions', async (req, res) => {
       const contest = await Contest.fromID(contestId);
       contest.ended = contest.isEnded();
       if (contest.ended || // If the contest is ended
-        (curUser && contest.isSupervisior(curUser)) // Or if the user have the permission to check
+        (curUser && await contest.isSupervisior(curUser)) // Or if the user have the permission to check
       ) {
         where.type = { $eq: 1 };
         where.type_info = { $eq: contestId };