Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

bintrans: reinstate a test case that I lost

Reported by: https://ci.freebsd.org/job/FreeBSD-main-amd64-test/21166

bintrans: move files to a new directory

And reflect the change in various places.