ports-mgmt/portfmt: Update to g20200924

Changelog: https://github.com/t6/portfmt/compare/11fdf0b5dcd9d7e5ca0686bcaca056d99b1d3688...57e2a01dedeaf353bced82e76942abeaed205b14

The GitHub repo for portfmt has been marked as archived and
read-only. So probably the current version is the last one.

PR: 252932
Submitted by: Naram Qashat <cyberbotx@cyberbotx.com>
Approved by: arrowd, tcberner (mentors, implicit)