Disables zk-elgamal-proof program

Active on mainnet-beta (epoch 805), testnet (epoch 801) and devnet (epoch 899).

Introduced in anza-xyz/agave PR #6523.

Feature id zkdoVwnSFnSLtGJG7irJPEYUpmb4i7sGMGcnN6T9rnC.

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