nativeTokenIsEth logic fixed in ParentToChildMessageCreator

[tadad]

addresses #534

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[hkalodner]

@cla-bot check

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The cla-bot has been summoned, and re-checked this pull request!

[spsjvc]

Hey @tadad, thank you for the contribution!

I'll have to close this PR in favor of #541 since we want to have the same fix in both v3 and v4.