Fix additional bug in ECAdd #1666
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…se to another bug found/fixed in my original writeup.
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Team from PsiQuantum reached out and pointed out another bug in the circuit nearly equivalent to one of the other ones that I found/fixed.
When [(a, b) = (0, 0) AND x = 0] OR [(x, y) = (0, 0) AND a = 0], the f_1 flag is not cleared. I added the same fix to this situation that I did in the similar scenario when the b/y values are all 0 for the f_2 flag. This cost 2 3n-controlled toffolis.