core/state: reduce one alloc

[cuiweixie]

this code:

func BenchmarkAccessList_Copy(b *testing.B) {
	al := newAccessList()
	for b.Loop() {
		_ = al.Copy()
	}
}

goos: darwin
goarch: arm64
pkg: github.com/ethereum/go-ethereum/core/state
cpu: Apple M1 Pro
                   │   old.txt   │               new.txt               │
                   │   sec/op    │   sec/op     vs base                │
AccessList_Copy-10   69.95n ± 2%   42.52n ± 2%  -39.21% (p=0.000 n=20)

                   │   old.txt   │              new.txt               │
                   │    B/op     │    B/op     vs base                │
AccessList_Copy-10   128.00 ± 0%   80.00 ± 0%  -37.50% (p=0.000 n=20)

                   │  old.txt   │              new.txt               │
                   │ allocs/op  │ allocs/op   vs base                │
AccessList_Copy-10   3.000 ± 0%   2.000 ± 0%  -33.33% (p=0.000 n=20)

just elimate the make make(map[common.Address]int)