KKManager Card Browser - Sort by file size sorts by number, but ignores KB vs MB

[georgerickle]

Describe the bug
Four cards of sizes,
399 KB,
4.1 MB
450 KB
5 KB
will sort in that order, the correct order is
5KB
399KB
450KB
4.1MB

Expected behavior
Probably easier to just list absolute bytes instead of using suffixes.

To Reproduce
Steps to reproduce the behavior:

1. View, Card Browser
2. Size, to sort by size
   ....
3. See error

Screenshots
If applicable, add screenshots to help explain your problem.

Additional information