fix num_samles not being passed to optimized hist fc rountine of torc… #4467

Job	Run time
lint	1m 31s
docs	9m 13s
check-examples (03-FFT-examples.ipynb)	5m 41s
tests (macos-latest, 3.9, all)	44m 13s
check-examples (04-RNN-examples.ipynb)	8m 4s
tests (ubuntu-latest, 3.9, all)	30m 52s
check-examples (00-quickstart.ipynb)	6m 43s
check-examples (02-data-processing.ipynb)	8m 46s
check-examples (01-multi-time-series-and-covariates.ipynb)	10m 4s
	2h 5m 7s

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