lwk_cli hangs on exit

When running `lwk_cli server start` to use as a backend for peerswap in place of `elementsd`, it seems to get stuck terminating itself.

OS: Fedora 40

```
[2024-12-17T20:12:02Z DEBUG lwk_app] method: wallet_details params: Some(Object {"name": String("testwallet1")})
^C[2024-12-18T02:30:10Z DEBUG lwk_cli] Received ctrl-c signal
[2024-12-18T02:30:10Z DEBUG tiny_http] Terminating accept thread
^C^C^C^C^C
```

```
$ ps aux | grep lwk
user 17375 0.1 0.1 632840 14632 pts/7 Sl+ Dec02 29:07 lwk_cli server start
```