fixed index error in s4b term for LRCC2 #2013

Job	Run time
macos-latest: clang++ Release Threads	15m 48s
macos-latest: clang++ Release Threads	15m 48s
macos-latest: clang++ Release OneTBB	2m 3s
macos-latest: clang++ Release OneTBB	3m 32s
macos-latest: clang++ Release PaRSEC	2m 6s
macos-latest: clang++ Release PaRSEC	2m 6s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	36m 38s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	36m 38s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 39s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 39s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 51s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	2m 51s
macos-latest: clang++ Debug Threads	19m 45s
macos-latest: clang++ Debug Threads	19m 45s
macos-latest: clang++ Debug OneTBB	2m 21s
macos-latest: clang++ Debug OneTBB	2m 21s
macos-latest: clang++ Debug PaRSEC	2m 52s
macos-latest: clang++ Debug PaRSEC	2m 52s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 19s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	48m 19s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 33s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	2m 33s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 14s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 14s
	4h 41m 47s

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