Fix intermittent failure in feature_pegin_subsidy.py - #1576
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feature_pegin_subsidy.py has several assertions comparing the burn subsidy against hardcoded constants assumed fixed-length witness (t * 72 bytes per signature), but the actual subsidy is computed by the node from the parent-chain deposit transaction's real fee and vsize. DER-signature lengths on the parent-chain transaction vary by a byte or two causing a rare intermittent failure.
Replaced hardcoded subsidy values with a Python function that replicates
CheckPeginSubsidyAndMinimum's computation.