Update sn3d.cc #8646

Job	Run time
classicmode_1d_3dgrid	7m 44s
classicmode_3d	7m 3s
kilonova_1d_1dgrid	4m 24s
kilonova_1d_3dgrid	4m 46s
kilonova_2d_2dgrid	6m 38s
kilonova_2d_2dgrid_barnesthermalisation	6m 15s
kilonova_2d_2dgrid_expansionopac	4m 33s
kilonova_2d_2dgrid_xcomgammaphotoion	4m 49s
kilonova_2d_3dgrid	6m 40s
nebular_1d_3dgrid	10m 47s
nebular_1d_3dgrid_limitbfest	13m 10s
combine_checksums	22s
	1h 17m 11s

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