sodium_grabber_installer: fix kwarg spacing

```
************* Module sodium_grabber_installer
pkg/smartos/esky/sodium_grabber_installer.py:16: [C0326(bad-whitespace), ] No space allowed around keyword argument assignment
    sources = [path.join(HERE, 'sodium_grabber.c')],
            ^
pkg/smartos/esky/sodium_grabber_installer.py:17: [C0326(bad-whitespace), ] No space allowed around keyword argument assignment
    libraries = ['sodium'],
              ^
```