net/minidlna: update to my snapshot on github

The software functionality has bitrot a bit due to updated
dependencies:

• sendfile(2) support test was broken with new clang
• "Recenty Added" folders were broken due to stricter SQLite

Since upstream is usually slow on pulling in fixes, let's
switch to my snapshot again.

Reviewed by: eugen
Differential Revision: https://reviews.freebsd.org/D48238