op-node: conf depth filter should not filter out genesis

[protolambda]

If we are requesting block 0 by number it must not be filtered out because of the confirmation depth filter, the genesis (even if below rollup genesis) always needs to be available as starting point.

[changeset-bot]

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Latest commit: dfa1aa5

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[mergify]

This PR changes implementation code, but doesn't include a changeset. Did you forget to add one?

[protolambda]

Added a testcase

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