[mimp] Missing argument 2 for folderpref()

[Chuck Hagenbuch]

Quoting Volker Then <vt at volkerthen.com>:

> the new cvs version of mimp with removed folders parameters produces
> some errors after logging in:
>
> Warning: Missing argument 2 for folderpref() in
> /var/www/html/horde-cvs/mimp/lib/MIMP.php on line 689

Fixed.

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams