Remove CChainParams from AcceptBlock and AcceptBlockHeader
Remove CChainParams from AcceptBlock and AcceptBlockHeader

Summary: Once again, we have Config.

Test Plan:
  make check

Reviewers: freetrader, sickpig, kyuupichan, #bitcoin_abc

Reviewed By: freetrader, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D165

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