Fix mv read loop hardcoding 4 instead of nnode #4531

Job	Run time
Lint Gate	1m 20s
Detect File Changes	9s
Github (macos, mpi, no-debug, false)	1h 27m 7s
Github (ubuntu, mpi, debug, true)	1h 19m 47s
Github (ubuntu, mpi, no-debug, true)	1h 33m 45s
Georgia Tech \| Phoenix (cpu)	1h 2m 42s
Oak Ridge \| Frontier (gpu-omp)	8h 10m 1s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Github (ubuntu, no-mpi, single, no-debug, false)	29m 9s
Github (ubuntu, mpi, no-debug, false)	2h 15m 15s
Oak Ridge \| Frontier (gpu-acc)	1s
Github (macos, mpi, debug, false)	1h 18m 47s
Georgia Tech \| Phoenix (gpu-acc)	32m 31s
Github (ubuntu, mpi, debug, false)	2h 40m 10s
Oak Ridge \| Frontier (AMD) (cpu)	8h 10m 1s
Georgia Tech \| Phoenix (gpu-omp)	1s
Oak Ridge \| Frontier (cpu)	1s
	1d 5h 0m 48s

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