Fix a bug in compton scattering shell selection #8328

Job	Run time
filter-changes	6s
Python 3.12 (omp=y, mpi=y, dagmc=y, libmesh=, event=	18m 26s
Python 3.12 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n	18m 32s
Python 3.12 (omp=y, mpi=y, dagmc=, libmesh=y, event=	18m 31s
Python 3.12 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n	18m 36s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=y, event=	18m 30s
Python 3.14t (omp=n, mpi=n, dagmc=, libmesh=, event=	18m 28s
Python 3.12 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n	18m 37s
Python 3.12 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n	18m 27s
Python 3.12 (omp=y, mpi=n, dagmc=, libmesh=, event=y	18m 27s
Python 3.14 (omp=n, mpi=n, dagmc=, libmesh=, event=	18m 31s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event=	18m 12s
coverage	4s
Check CI status	2s
	3h 23m 29s

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