New review comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/24072#discussion_r471055294

Comment:
Even if we agree of this logic, is it better to use:
```
df -P / | awk 'NR == 2 {print $1}'
```
instead of relying on forcing on `UUID=` on `/etc/fstab`?