[ulaform] minor bugfix

[Chuck Hagenbuch]

Quoting Bo Daley <bo at tilda.com.au>:

> this is the first time i've used ulaform so I'm probably missing something
> really obvious, but i was getting a 'variable sql_sprintf undefined' error
> until I made this very minor change to sql.php (patch attached).

Looks fine to me. Committed, thanks.

-chuck

--
Charles Hagenbuch, <chuck at horde.org>
The alligators were there, too, in a bathtub inside the house.