Calculate disk usage as binary instead of decimal

[scambra]

Reporting Issues:

• Branch: master

• Commit hash: 3f78517

• Operating system: lsiobase/alpine.python.armhf:3.9

• Python version: 2.7.15

• What you did?

Setup system info and enabled in dashboard

• What happened?

I see free disk space calculated as decimal, 3348288045056 bytes free, displayed as 3.3TB

• What you expected?

I was expecting to see 3.1TB as I see in console, calculated as binary (3.1 TiB)

df -h

Filesystem Size Used Avail Use% Mounted on
//192.168.0.10/share/ 3.7T 593G 3.1T 16% /mnt/medialibrary