Fix a bug in compton scattering shell selection #8326

Job	Run time
filter-changes	6s
Python 3.12 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n	20m 24s
Python 3.12 (omp=y, mpi=y, dagmc=, libmesh=y, event=	20m 23s
Python 3.12 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n	20m 23s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=y, event=	20m 23s
Python 3.14t (omp=n, mpi=n, dagmc=, libmesh=, event=	20m 24s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=, event=y	20m 23s
Python 3.12 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n	14m 42s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event=	20m 6s
Python 3.14 (omp=n, mpi=n, dagmc=, libmesh=, event=	14m 32s
Python 3.12 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n	19m 56s
Python 3.12 (omp=y, mpi=y, dagmc=y, libmesh=, event=	20m 24s
coverage	3s
Check CI status	4s
	3h 32m 13s

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