Fix quota display

please replace by:

```python
s = "%s: used %.3g %s (%d%%) quota %.3g %s (%.3g %s hard limit)" % (
```

and then also include `format_sizes(quota_information.soft*1024)[1]` in the tuple

that should result in

```
VSC_HOME: used 2.35 GiB (41%) quota 5.7 GiB (6 GiB hard limit)
```