Correct calculation in ProjectPointToPlane (backport #702) #204

Job	Run time
test / matrix-prep-os	4s
test / matrix-prep-bazelversion	4s
test / test (ubuntu-latest, 7.3.1, ., true)	2m 58s
test / test (ubuntu-latest, 8.0.0rc1, ., true)	3m 14s
	6m 20s

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