Use an incorrect copy command syntax copy instead of \copy and cannot quit app.

Use an incorrect copy command syntax copy instead of \copy and cannot quit app after that:

```
Server: PostgreSQL 14.15
Version: 4.3.0
Home: http://pgcli.com
simplifi-live> copy (select id from transcoding_formats order by id) to stdout csv;
COPY cannot be used with this method; use copy() instead
Time: 0.043s
simplifi-live> quit
A transaction is ongoing. Choose `c` to COMMIT, `r` to ROLLBACK, `a` to abort exit. [a]: r^M
```

Reproduce the session shown in the issue with PostgreSQL 14.15 and pgcli 4.3.0, starting with the COPY command and then the quit flow. Trace how the CLI handles `copy (...) to stdout csv` and the ongoing transaction prompt; done means the command guidance and subsequent exit behavior are correct and covered by a regression test.

Written by the indexing model from the issue text.