fix dequeue block calculation #209
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This PR fixes the dequeue block calculation for consolidation & withdrawal requests, which got out of sync with large request amounts across epoch transitions:
(tx to request mapping is off by 2 here, the tx in row 3 should be at row 1)
Looking at the DB, the issue was introduced during epoch 13->14 transition, where the algorithm assumed 3 requests got dequeued in block 469 & 470:
This was due to a duplicate queue subtraction during epoch transitions.