Bug#454595: spamassassin: create preferences for virtual users doesn't work by default

[Noah Meyerhans]

Control: tags -1 + upstream confirmed

I've confirmed that this is still present in 4.0.1.  I've pinged
upstream via https://bz.apache.org/SpamAssassin/show_bug.cgi?id=5663 and
we'll see if they have anything to say...

noah