SIMD-0438: Reset lamports per byte to legacy value of 6960

Not active on mainnet-beta; not active on testnet; not active on devnet.

Introduced in anza-xyz/agave PR #15177.

Feature id rnt8ZQpz2HYhX3DkYBDGjJS1a36mYq69oXka7JrhEdi.

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• SIMD-0438

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