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

[chirhonul]

I've made the changes mentioned as a `TODO` in a branch based on this changeset:

* https://github.com/chirhonul/bisq-core/compare/1808-block-parse-tweaks...chirhonul:1808-check-blockhash?expand=1

I will open the second PR when this one has been merged.

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