mining: Remove testnet min diff reduction support. #3109
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This modifies the internal mining template generator and CPU miner to no longer support the version 3 testnet minimum difficulty reduction logic that no longer applies given all new blocks on testnet now enforce difficulty throttling instead of the minimum difficulty reduction rule.
Note that this does not modify the consensus enforcement logic since it is still required for all existing version 3 testnet blocks prior to the difficulty throttling change.