exp/orderbook: Fix bug in CalculatePoolExpectation() (#5541) #4427

Job	Run time
Test (and push) verify-range image	3m 34s
Integration tests (ubuntu-20.04, 1.21, 12, 21)	53m 59s
Integration tests (ubuntu-20.04, 1.21, 12, 22)	54m 42s
Integration tests (ubuntu-20.04, 1.21, 16, 21)	54m 45s
Integration tests (ubuntu-20.04, 1.21, 16, 22)	55m 43s
Integration tests (ubuntu-20.04, 1.22, 12, 21)	54m 28s
Integration tests (ubuntu-20.04, 1.22, 12, 22)	55m 17s
Integration tests (ubuntu-20.04, 1.22, 16, 21)	54m 56s
Integration tests (ubuntu-20.04, 1.22, 16, 22)	55m 14s
Integration tests (ubuntu-22.04, 1.21, 12, 21)	50m 33s
Integration tests (ubuntu-22.04, 1.21, 12, 22)	47m 22s
Integration tests (ubuntu-22.04, 1.21, 16, 21)	53m 41s
Integration tests (ubuntu-22.04, 1.21, 16, 22)	56m 4s
Integration tests (ubuntu-22.04, 1.22, 12, 21)	55m 2s
Integration tests (ubuntu-22.04, 1.22, 12, 22)	52m 23s
Integration tests (ubuntu-22.04, 1.22, 16, 21)	54m 55s
Integration tests (ubuntu-22.04, 1.22, 16, 22)	54m 56s
	14h 27m 34s

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