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
```