fix: use original value in prestate tracer #15
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Closes #13
This could potentially be simplified if we can simply use the result's statediff if this has the initial value for modified slots and not just the previousbecause the prestate tracer should only include changed slots:
https://github.com/ethereum/go-ethereum/blob/bc0b87ca196f92e5af49bd33cc190ef0ec32b197/eth/tracers/native/prestate.go#L216-L224
simplifies prestate result by only checking changed accounts and using the original value
cc @rakita