`multipass launch` pads its output to 80 characters with whitespace

You can't _see_ this per se, but copying/pasting whole lines from my console demonstrates the problem:

```shell
% multipass launch bionic
Launched: steady-koel                                                           
```

```python3
>>> len("Launched: steady-koel                                                           ")
80
```

I would expect no trailing whitespace.