If you're not going to claim any loss, just enter the 1099-K and select "Other" for type of income and also mention "gambling reported on 1099-K" for the reason for amending. (so they don't wonder what happened to the 1,100 gambling reported on the original return)
I'm sure the IRS will make changes to the 1099-K, so no sense trying to be consistent with how you report it at this point.
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