Chainwebjs: fix implementation of recent headers #3103
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The implementation of recent headers uses as upper bound for the respective branch query the block on the respective chain form the latest cut. However, queried heights are computed based on the lastest height on chain 0. In cases when chain 0 is ahead of the queries chain the query fails if for small confirmation depths.
This PR fixes this issues by always using the height of the block on the respective chain as reference for computing queried block heights.
I tested this locally in an application that uses the chainwebjs package.