Fix wall emissivity out of bounds #7201

Job	Run time
Build SU2 (tsan) (BaseOMP-tsan)	13m 2s
Build SU2 (tsan) (ReverseOMP-tsan)	29m 18s
Build SU2 (BaseMPI)	13m 25s
Build SU2 (ReverseMPI)	16m 7s
Build SU2 (ForwardMPI)	11m 40s
Build SU2 (BaseNoMPI)	8m 14s
Build SU2 (ReverseNoMPI)	13m 31s
Build SU2 (ForwardNoMPI)	9m 29s
Build SU2 (BaseOMP)	8m 1s
Build SU2 (ReverseOMP)	15m 52s
Build SU2 (ForwardOMP)	10m 42s
Unit Tests (test_driver)	1m 2s
Regression Tests (vandv.py)	2m 26s
Unit Tests (test_driver_AD)	1m 2s
Regression Tests (tutorials.py)	4m 23s
Unit Tests (test_driver_DD)	1m 0s
Regression Tests (parallel_regression.py)	13m 18s
Regression Tests (parallel_regression_AD.py)	7m 4s
Regression Tests (serial_regression.py)	16m 20s
Regression Tests (serial_regression_AD.py)	5m 25s
Regression Tests (hybrid_regression.py)	10m 59s
Regression Tests (hybrid_regression_AD.py)	4m 15s
Thread Sanitizer Tests (hybrid_regression.py)	26m 49s
Thread Sanitizer Tests (hybrid_regression_AD.py)	10m 0s
	4h 13m 24s

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