fixup! Add page deletion function

Author: ohtake

server-websocket.js

@@ -105,7 +105,7 @@ router.post('/deletePage', (req, res) => {
     res.end(JSON.stringify({ status: 'SUCCESS', msg: `Delete ${room}` }));
   }, (ex) => {
     console.error(ex);
-    res.end(JSON.stringify({ status: 'FAILURE', msg: 'Y instance destroy error' }));
+    res.end(JSON.stringify({ status: 'FAILURE', msg: 'Failed to delete database' }));
   });
 });