[dev] Fix for category sql driver for pgsql

[Chuck Hagenbuch]

Quoting "Jason M. Felice" <jfelice at cronosys.com>:

> Target column name "key" was single-quoted instead of double-quoted.  I
> don't know what database will grok that, but I'm pretty sure the
> double-quotes are SQL spec.

Committed, thanks.

-chuck

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