Remove unused vk_gamma2 from zkey header #45
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vk_gamma2 in ZKeyUtils::Header was never used by the prover, but still parsed and stored a pointer to it. This change removes the field from the header and stops storing the pointer, while still reading the corresponding bytes from section 2 to keep the file cursor and endReadSection checks correct. The .zkey format and the layout of the Groth16 verifying key remain fully respected, but the header no longer exposes a dead field.