Fix MUSCL THINC right-state using already-overwritten left-state values #4640

Job	Run time
Detect File Changes	11s
Lint Gate	1m 13s
Github (macos, mpi, no-debug, false)	1s
Github (ubuntu, mpi, debug, false)	28m 36s
Github (ubuntu, mpi, no-debug, true)	24m 41s
Github (macos, mpi, debug, false)	1s
Oak Ridge \| Frontier (gpu-omp)	28m 36s
Github (ubuntu, mpi, debug, true)	24m 43s
Oak Ridge \| Frontier (gpu-acc)	28m 36s
Georgia Tech \| Phoenix (gpu-acc)	1s
Georgia Tech \| Phoenix (cpu)	1s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Oak Ridge \| Frontier (cpu)	1s
Github (ubuntu, no-mpi, single, no-debug, false)	22m 58s
Github (ubuntu, mpi, no-debug, false)	28m 36s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Georgia Tech \| Phoenix (gpu-omp)	28m 36s
	3h 36m 53s

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