cmd/evm: fix evm basefee

[holiman]

This PR fixes #30279

We did not use the basefee from the genesis, and instead the defaults were used from runtime.go/setDefaults-function

	if cfg.BaseFee == nil {
		cfg.BaseFee = big.NewInt(params.InitialBaseFee)
	}

That method will still be used if it's not provided in genesis.

---

With this PR

[user@work go-ethereum]$ go run ./cmd/evm  --debug --gas 0xffffff --nomemory=false --json --code 4860005260406000f3 --prestate ./genesis.json run
INFO [08-08|15:55:21.436] Persisted trie from memory database      nodes=1 size=142.00B time="6.577µs" gcnodes=0 gcsize=0.00B gctime=0s livenodes=0 livesize=0.00B
{"pc":0,"op":72,"gas":"0xffffff","gasCost":"0x2","memSize":0,"stack":[],"depth":1,"refund":0,"opName":"BASEFEE"}
{"pc":1,"op":96,"gas":"0xfffffd","gasCost":"0x3","memSize":0,"stack":["0x3b9aca00"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":3,"op":82,"gas":"0xfffffa","gasCost":"0x6","memSize":0,"stack":["0x3b9aca00","0x0"],"depth":1,"refund":0,"opName":"MSTORE"}
{"pc":4,"op":96,"gas":"0xfffff4","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":[],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":6,"op":96,"gas":"0xfffff1","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":["0x40"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":8,"op":243,"gas":"0xffffee","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":["0x40","0x0"],"depth":1,"refund":0,"opName":"RETURN"}
{"output":"000000000000000000000000000000000000000000000000000000003b9aca000000000000000000000000000000000000000000000000000000000000000000","gasUsed":"0x14"}
#### LOGS ####

[lightclient]

Was able to replicate the issue and verify this fix works.

$ go run ./cmd/evm --debug --gas 0xffffff --nomemory=false --json --code 4860005260406000f3 --prestate ./genesis.json run
INFO [08-08|08:34:17.491] Persisted trie from memory database      nodes=35 size=4.99KiB time="37.75µs" gcnodes=0 gcsize=0.00B gctime=0s livenodes=0 livesize=0.00B
{"pc":0,"op":72,"gas":"0x23f3e20","gasCost":"0x2","memSize":0,"stack":[],"depth":1,"refund":0,"opName":"BASEFEE"}
{"pc":1,"op":96,"gas":"0x23f3e1e","gasCost":"0x3","memSize":0,"stack":["0x3b9aca00"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":3,"op":82,"gas":"0x23f3e1b","gasCost":"0x6","memSize":0,"stack":["0x3b9aca00","0x0"],"depth":1,"refund":0,"opName":"MSTORE"}
{"pc":4,"op":96,"gas":"0x23f3e15","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":[],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":6,"op":96,"gas":"0x23f3e12","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":["0x40"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":8,"op":243,"gas":"0x23f3e0f","gasCost":"0x3","memory":"0x000000000000000000000000000000000000000000000000000000003b9aca00","memSize":32,"stack":["0x40","0x0"],"depth":1,"refund":0,"opName":"RETURN"}
{"output":"000000000000000000000000000000000000000000000000000000003b9aca000000000000000000000000000000000000000000000000000000000000000000","gasUsed":"0x14"}
#### LOGS ####
$ git pr 30281 upstream
$ go run ./cmd/evm --debug --gas 0xffffff --nomemory=false --json --code 4860005260406000f3 --prestate ./genesis.json run
INFO [08-08|08:35:05.186] Persisted trie from memory database      nodes=35 size=4.99KiB time="40.167µs" gcnodes=0 gcsize=0.00B gctime=0s livenodes=0 livesize=0.00B
{"pc":0,"op":72,"gas":"0x23f3e20","gasCost":"0x2","memSize":0,"stack":[],"depth":1,"refund":0,"opName":"BASEFEE"}
{"pc":1,"op":96,"gas":"0x23f3e1e","gasCost":"0x3","memSize":0,"stack":["0x7"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":3,"op":82,"gas":"0x23f3e1b","gasCost":"0x6","memSize":0,"stack":["0x7","0x0"],"depth":1,"refund":0,"opName":"MSTORE"}
{"pc":4,"op":96,"gas":"0x23f3e15","gasCost":"0x3","memory":"0x0000000000000000000000000000000000000000000000000000000000000007","memSize":32,"stack":[],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":6,"op":96,"gas":"0x23f3e12","gasCost":"0x3","memory":"0x0000000000000000000000000000000000000000000000000000000000000007","memSize":32,"stack":["0x40"],"depth":1,"refund":0,"opName":"PUSH1"}
{"pc":8,"op":243,"gas":"0x23f3e0f","gasCost":"0x3","memory":"0x0000000000000000000000000000000000000000000000000000000000000007","memSize":32,"stack":["0x40","0x0"],"depth":1,"refund":0,"opName":"RETURN"}
{"output":"00000000000000000000000000000000000000000000000000000000000000070000000000000000000000000000000000000000000000000000000000000000","gasUsed":"0x14"}
#### LOGS ####