If the past is any indictation on the steam pricing mishaps, they won't charge you extra after-the-fact as it's their error. But yes, you could always buy an extra gift copy and give it to someone else if you want the developers to get the full $20.
They'll probably correct it within a day or so, and everyone thereafter will have to pay the new $19.99 (minus pre-order discount, if they have one).
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