Tensor: rever accidental changes to tensor.h #1397

Job	Run time
macos-latest: clang++ Debug Pthreads	15m 35s
ubuntu-24.04: /usr/bin/g++-14 Release PaRSEC	6m 40s
ubuntu-24.04: /usr/bin/g++-14 Debug PaRSEC	8m 23s
macos-latest: clang++ Release PaRSEC	27m 25s
ubuntu-24.04: /usr/bin/g++-14 Release Pthreads	6m 25s
ubuntu-24.04: /usr/bin/g++-14 Debug Pthreads	10m 7s
macos-latest: clang++ Release Pthreads	14m 10s
macos-latest: clang++ Debug PaRSEC	17m 0s
	1h 45m 45s

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