AD fix for CorrBijector #495

Job	Run time
test (1.6, ubuntu-latest, x64, ForwardDiff)	6m 11s
test (1.6, ubuntu-latest, x64, Tracker)	4m 58s
test (1.6, ubuntu-latest, x64, ReverseDiff)	5m 55s
test (1.6, ubuntu-latest, x64, Zygote)	9m 2s
test (1.6, macOS-latest, x64, ForwardDiff)	6m 26s
test (1.6, macOS-latest, x64, Tracker)	8m 55s
test (1.6, macOS-latest, x64, ReverseDiff)	7m 9s
test (1.6, macOS-latest, x64, Zygote)	7m 35s
test (1, ubuntu-latest, x64, ForwardDiff)	5m 33s
test (1, ubuntu-latest, x64, Tracker)	7m 10s
test (1, ubuntu-latest, x64, ReverseDiff)	5m 58s
test (1, ubuntu-latest, x64, Zygote)	6m 57s
test (1, macOS-latest, x64, ForwardDiff)	7m 37s
test (1, macOS-latest, x64, Tracker)	7m 13s
test (1, macOS-latest, x64, ReverseDiff)	6m 52s
test (1, macOS-latest, x64, Zygote)	8m 8s
	1h 51m 39s

Provide feedback