japanese/ddskk: Update to 16.2

kenji@k2r.org took maintainership based on:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222421#c6

Additional port changes:

• Changed to DISTVERSION
• Moved URLs with better availability to the beginning of MASTER_SITES

PR: 222421
Submitted by: kenji.rikitake@acm.org
Approved by: tcberner (mentor, implicit)