ls consistency: make tctl db ls output consistent
ls consistency: make tctl db ls output consistent

```
Host Name     Protocol URI          Labels                          Version
---- -------- -------- ------------ ------------------------------- -------------
corn postgres postgres 0.0.0.0:5432 teleport.dev/origin=config-file 8.0.0-alpha.1
```

gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport,gravitational/teleport