chore: switch gas check order in blake2 precompile

[pcy190]

Go-ethereum always check gas before checking the detailed flag in [1]:

func RunPrecompiledContract(p PrecompiledContract, input []byte, suppliedGas uint64, logger *tracing.Hooks) (ret []byte, remainingGas uint64, err error) {
	gasCost := p.RequiredGas(input)
	if suppliedGas < gasCost {
		return nil, 0, ErrOutOfGas
	}
	if logger != nil && logger.OnGasChange != nil {
		logger.OnGasChange(suppliedGas, suppliedGas-gasCost, tracing.GasChangeCallPrecompiledContract)
	}
	suppliedGas -= gasCost
	output, err := p.Run(input)
	return output, suppliedGas, err
}

[1]https://github.com/ethereum/go-ethereum/blob/941ae33d7e0b36afc2f8551884f555d963de7c6b/core/vm/contracts.go#L190-L206

Therefore, when the final flag is invalid (neither 1 nor 0) in blake2 precompile, and the gas limit is below the minimum requirement, the behavior differs between revm and go-ethereum.

[DaniPopes]

i don't think this matters much because all error cases are the same? but it's probably fine

[DaniPopes]

technically this check also would go below gas check, and then gas check would have to handle empty input...

[rakita]

It is a semantic change, lgtm.

Have renamed the issue to chore: as it does not affect consensus between revm and geth.