Fix order of deinitialization #1969

Job	Run time
NAMD (devel) / test_backends	5m 34s
GROMACS (release-2023) / test_backends	3m 56s
LAMMPS (develop) / test_backends	10m 11s
GROMACS (main) / test_backends	11m 59s
VMD / test_backends	1m 33s
	33m 13s

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