Add 1 classroom students to L6Sat

classroom_data/classes.json

@@ -39,6 +39,10 @@
       {
         "student_id": "蔡昊儒",
         "display_name": "蔡昊儒"
+      },
+      {
+        "student_id": "関係",
+        "display_name": "関係ないです"
       }
     ]
   },