[BUG] V5: resources monitor shows no used space

[RSWilli]

Submission checklist

• I have searched existing issues and confirmed this is not a duplicate.
• I am using the latest available version of Noctalia.

Bug description

Resources doesn't show the actually used GB of the disk, only the used percentage.

Steps to reproduce

1. open control center
2. open system monitor

Expected behavior

No used space

Actual behavior

Show used space :)

Logs / error output

Noctalia version

v5.0.0

Compositor

Niri

Distribution

NixOS

Environment information

Installed via flake

Additional context

No response