[bisq-network/bisq-core] Slightly simplify some BlockParser logic (#162)

[chirhonul]

Thanks for the review!

@ManfredKarrer: I'd prefer to change the functionality of `isBlockAlreadyAdded()` to make it more robust in a follow-up PR (see comment inline). Please take another look and see if you agree that we can merge this (once current release is out) as-is.

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