Canada adheres to ISO 8601, let's make the locale reflecting that fact

PR: 200079
MFC after: 1 week
Submitted by: Dan McGregor <dan.mcgregor@usask.ca>
Reported by: A.J. Kehoe IV (Nanoman) <freebsd-bugs@nanoman.ca>
Differential Revision: https://reviews.freebsd.org/D9925