Fixing doinked maildirs thanks to updates

Had to update a bunch of client systems lately due to our AI enabled storm of 0-days coming in hard not long ago. This of course means that configs get stomped by hurtful package maintainers. In this particular case, it was dovecot and postfix's mailbox dirs. On one system I thought I had been particularly tricky in symlinking the dir the maintainer prefers to the actual dir, but they nuked it and…