Fix bug where the same mesh is written multiple times to settings.xml #5695

Job	Run time
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=, event=y vectfit=)	1h 53m 20s
Python 3.11 (omp=n, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 30m 15s
Python 3.13 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	1h 1m 17s
Python 3.11 (omp=y, mpi=n, dagmc=n, libmesh=n, event=n vectfit=n)	1h 47m 20s
Python 3.11 (omp=y, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 33m 24s
Python 3.11 (omp=n, mpi=y, dagmc=n, libmesh=n, event=n vectfit=n)	1h 7m 7s
Python 3.11 (omp=n, mpi=y, dagmc=, libmesh=, event= vectfit=y)	1h 13m 56s
Python 3.11 (omp=y, mpi=y, dagmc=, libmesh=y, event= vectfit=)	1h 42m 39s
Python 3.11 (omp=y, mpi=y, dagmc=y, libmesh=, event= vectfit=)	1h 47m 56s
Python 3.11 (omp=y, mpi=n, dagmc=, libmesh=y, event= vectfit=)	1h 49m 37s
Python 3.12 (omp=n, mpi=n, dagmc=, libmesh=, event= vectfit=)	57m 50s
finish	3s
	16h 24m 44s

Provide feedback