config/debian/dak.conf: keep dak-unpriv user in postgres

dak show-deferred now runs as dak-unpriv and needs a (read-only) database
connection.

config/debian/dak.conf

@@ -60,7 +60,7 @@ Import-Users-From-Passwd
 {
   ValidGID "800";
   // Comma separated list of users who are in Postgres but not the passwd file
-  KnownPostgres "postgres,dak,katie,release,qa,www-data,guest,repuser";
+  KnownPostgres "postgres,dak,dak-unpriv,katie,release,qa,www-data,guest,repuser";
 };
 
 Clean-Queues