fix(geth): remove unused txpool variables and align comment #472

Job	Run time
nethermind (linux/arm64, ubuntu-24.04-arm)	2m 40s
reth (linux/arm64, ubuntu-24.04-arm, jemalloc,optimism)	22m 14s
geth (linux/arm64, ubuntu-24.04-arm)	2m 48s
geth (linux/amd64, ubuntu-24.04)	3m 44s
nethermind (linux/amd64, ubuntu-24.04)	2m 50s
reth (linux/amd64, ubuntu-24.04, jemalloc,asm-keccak,optimism)	28m 36s
	1h 2m 52s

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