Log Message:
chat/prosody: always create the directory for the PID file

The RC script for prosody now always creates the corresponding
sub-directory for prosody's PID file. This is inspired by the RC script
for mdnsd in NetBSD, and for dbus in pkgsrc; thanks spz@ for the
suggestion!

Bumps PKGREVISION.

Tested on NetBSD/amd64.

XXX pull-up to pkgsrc-2022Q2 (completes request 6649)