multimedia/plexmediaserver-plexpass: Update to 1.31.2.6739

ChangeLog: https://forums.plex.tv/t/plex-media-server/30447/558

NEW:

• Add series- and season-level preferences controlling audio and subtitle stream selection.

FIXES:

• Smart playlists could fail when set to show/season/artist/album types when requested by someone other than server admin.
• The server could exit unexpectedly if a database error occurred within certain notification-handling code.
• TV episodes with certain naming formats involving underscores could fail to be scanned in.

PR: 269882
Reported by: b.shertenlieb@yahoo.com (maintainer)