Fix integral zmin/zmax never initialized (copy-paste of ymin/ymax) #4388

Job	Run time
Detect File Changes	10s
Lint Gate	1m 20s
Github (ubuntu, mpi, debug, true)	1h 32m 48s
Github (ubuntu, mpi, debug, false)	2h 49m 6s
Github (ubuntu, mpi, no-debug, true)	1h 32m 57s
Github (macos, mpi, debug, false)	1h 21m 52s
Georgia Tech \| Phoenix (cpu)	1h 0m 28s
Github (ubuntu, no-mpi, single, no-debug, false)	29m 9s
Oak Ridge \| Frontier (cpu)	1d 0h 0m 0s
Github (macos, mpi, no-debug, false)	1h 17m 57s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Github (ubuntu, mpi, no-debug, false)	2h 16m 18s
Oak Ridge \| Frontier (gpu-acc)	1d 0h 0m 0s
Georgia Tech \| Phoenix (gpu-acc)	1h 14m 37s
Georgia Tech \| Phoenix (gpu-omp)	1h 9m 9s
Oak Ridge \| Frontier (AMD) (cpu)	1d 0h 0m 0s
Oak Ridge \| Frontier (gpu-omp)	1s
	3d 14h 45m 53s

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