Job retried through the interface gets its ID passed as a string to the queue event

... instead of an integer.

Hello,

To test this:
- Create a test job with a `queue.process` consumer without any callback.
- Add a queue-level event `job enqueue` and watch the job id.
- Get a job stuck in active state by restarting the server.
- Retry the job while in the UI.
- Here, the job id is a string in the queue event.

```
const queue = kue.createQueue();

queue.create('test', {test:'test'})
.attempts(2)
.removeOnComplete(false);

queue.process('test', (job, ctx, done) => {
//nil
});

queue.on('job enqueue', (jobId, type) => {
console.log(jobId);
});
```

### Workaround

Use `parseInt` in the queue event.

No file or test is identified in the issue. Reproduce the UI retry flow with the shown queue.process consumer and queue-level 'job enqueue' listener, then trace the retry path to the event emission. Done means a retried job's ID reaches the queue event as an integer, without requiring the parseInt workaround.

Written by the indexing model from the issue text.