Fix cornernode normal #8341

Job	Run time
Build SU2 (BaseMPI)	13m 43s
Build SU2 (asan) (BaseNoMPI-asan)	10m 27s
Build SU2 (ReverseMPI)	11m 15s
Build SU2 (asan) (ReverseNoMPI-asan)	28m 38s
Build SU2 (ForwardMPI)	8m 43s
Build SU2 (BaseNoMPI)	6m 0s
Build SU2 (ReverseNoMPI)	9m 12s
Build SU2 (tsan) (BaseOMP-tsan)	11m 58s
Build SU2 (ForwardNoMPI)	7m 46s
Build SU2 (tsan) (ReverseOMP-tsan)	28m 14s
Build SU2 (BaseOMP)	6m 10s
Build SU2 (ReverseOMP)	11m 15s
Build SU2 (ForwardOMP)	8m 22s
Unit Tests	0s
Regression Tests	0s
Thread Sanitizer Tests (hybrid_regression.py)	26m 54s
Thread Sanitizer Tests (hybrid_regression_AD.py)	11m 1s
Address Sanitizer Tests	0s
	3h 19m 38s

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