Bug: Status center shows TB/s instead of MB/s when copying from portable drives

### Description

Copying files sometimes show transfer rates as TB/s instead of MB/s... I freaked out the first time when I saw 390 TB/s transfer rates...

### Steps To Reproduce

Right after I updated to this release. When I was copying files.
I was trying to duplicate a file, then I saw this.

### Requirements

Show the correct measurements

### Files Version

3.0.5.0

### Windows Version

10.0.22635.2700

### Log File

[debug.log](https://github.com/files-community/Files/files/13361183/debug.log)

Start at the Status center's transfer-rate display and reproduce the issue while duplicating a file from a portable drive. Trace how the displayed measurement is selected, then verify that copying shows the correct unit rather than TB/s; the payload names no source file or test.

Written by the indexing model from the issue text.