[Dbmail] Fix to Horde IMP H3 for dbmail 2.0.x users

[Ville Ahonen]

FYI, if you are using IMP H3 with dbmail 2.0.x and you are annoyed by 
having all messages appear bolded in the mailbox (=unseen), do the 
following:

Open horde/imp/mailbox.php and replace the row
       if (!$h->seen || $h->recent) {

with

       if (!$h->seen) {

This will disable checking of the faulty recent flag, and only bold the 
unread messages. I'm using Horde 3.0.5 with IMP H3 4.0.3, but I can't 
see why it shouldn't work with all more recent H3 releases..

Cheers,

Ville