Fix MUSCL THINC right-state using already-overwritten left-state values #4529

Job	Run time
Detect File Changes	9s
Lint Gate	1m 19s
Oak Ridge \| Frontier (gpu-acc)	1s
Oak Ridge \| Frontier (cpu)	7h 9m 51s
Georgia Tech \| Phoenix (gpu-acc)	37m 15s
Georgia Tech \| Phoenix (cpu)	13m 45s
Georgia Tech \| Phoenix (gpu-omp)	1s
Oak Ridge \| Frontier (AMD) (cpu)	1s
Oak Ridge \| Frontier (gpu-omp)	1s
Oak Ridge \| Frontier (AMD) (gpu-omp)	1s
Github (ubuntu, mpi, debug, true)	1h 37m 0s
Github (ubuntu, mpi, no-debug, false)	2h 14m 48s
Github (ubuntu, mpi, no-debug, true)	1h 33m 26s
Github (ubuntu, mpi, debug, false)	3h 10m 27s
Github (ubuntu, no-mpi, single, no-debug, false)	28m 53s
Github (macos, mpi, debug, false)	44m 39s
Github (macos, mpi, no-debug, false)	1h 21m 47s
	19h 13m 24s

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