Fix a bug in compton scattering shell selection #8329

Job	Run time
filter-changes	5s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=y, event=	20m 6s
Python 3.14 (omp=n, mpi=n, dagmc=, libmesh=, event=	20m 2s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event=	19m 44s
Python 3.12 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n	7m 47s
Python 3.12 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n	8m 1s
Python 3.14t (omp=n, mpi=n, dagmc=, libmesh=, event=	20m 5s
Python 3.12 (omp=y, mpi=y, dagmc=y, libmesh=, event=	20m 18s
Python 3.12 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n	20m 1s
Python 3.12 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n	20m 0s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=, event=y	20m 1s
Python 3.12 (omp=y, mpi=y, dagmc=, libmesh=y, event=	20m 20s
coverage	4s
Check CI status	2s
	3h 16m 36s

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