What should I do? Should I resend?

Oooh, ouch!

Personally, I'd re-send with a little note that explains why you're re-sending. Don't assume that the agent will ignore such an obvious mistake. At least by admitting that you know you made a mistake, you're showing that you care about the product you put out there.

I'd re-send too, just to put your mind at ease. Things happen, and the agent would probably understand, but you'll probably stress over it. If you get rejected, you'll feel like that error was the reason why. No need to put yourself through that Querying is hard enough as it is.

I'd re-send as well -- for the reasons already stated,