Attaching to a container started interactively does not bring up a prompt until a line is entered

### Description

```
$ nerdctl run -ti --detach-keys=ctrl-a,ctrl-b --name what debian

$ nerdctl attach what
a
bash: a: command not found
root@eb0961704604:/#
```

Compare with docker:
```
$ nadocker attach what
root@75ece7734021:/#
```

### Steps to reproduce the issue

1.
2.
3.

### Describe the results you received and expected

na

### What version of nerdctl are you using?

main

### Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

### Host information

_No response_