Fix output only code length miscalculated

modules/admin.js

@@ -328,9 +328,11 @@ app.post('/admin/other', async (req, res) => {
     } else if (req.body.type === 'reset_codelen') {
       const submissions = await JudgeState.query();
       for (const s of submissions) {
+        if (s.type !== 'submit-answer') {
           s.code_length = s.code.length;
           await s.save();
         }
+      }
     } else {
       throw new ErrorMessage("操作类型不正确");
     }