Fix cornernode normal #8345

Job	Run time
Build SU2 (asan) (BaseNoMPI-asan)	10m 35s
Build SU2 (asan) (ReverseNoMPI-asan)	27m 11s
Build SU2 (tsan) (BaseOMP-tsan)	8m 0s
Build SU2 (tsan) (ReverseOMP-tsan)	16m 51s
Build SU2 (BaseMPI)	10m 6s
Build SU2 (ReverseMPI)	10m 8s
Build SU2 (ForwardMPI)	8m 31s
Build SU2 (BaseNoMPI)	5m 40s
Build SU2 (ReverseNoMPI)	8m 34s
Build SU2 (ForwardNoMPI)	7m 12s
Build SU2 (BaseOMP)	5m 38s
Build SU2 (ReverseOMP)	10m 37s
Build SU2 (ForwardOMP)	7m 45s
Regression Tests	0s
Unit Tests	0s
Thread Sanitizer Tests	0s
Address Sanitizer Tests	0s
	2h 16m 48s

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