confusing message about `snapcraft --destructive-mode clean`

[Ian Johnson]

If I specify the --destructive-mode option before an argument such as clean, then snapcraft will default to assuming that the build environment is multipass for some reason:

```
$ snapcraft --destructive-mode clean
Usage: snapcraft clean [OPTIONS] <part>...

Error: --destructive-mode cannot be used with build provider 'multipass'
```

The correct way to do this is to use

```
$ snapcraft clean --destructive-mode
```

but still that's not obvious from the error message and IMHO it should just work to specify the --destructive-mode option first.

[Ian Johnson (anonymouse67)]

This is still a problem with snapcraft 4.0 on candidate.