Update update_grid.cc #7243

Job	Run time
classicmode_1d_3dgrid	5m 54s
classicmode_3d	10m 58s
kilonova_1d_1dgrid	5m 33s
kilonova_1d_3dgrid	6m 13s
kilonova_2d_2dgrid	8m 29s
kilonova_2d_2dgrid_barnesthermalisation	7m 1s
kilonova_2d_2dgrid_expansionopac	6m 19s
kilonova_2d_2dgrid_xcomgammaphotoion	7m 1s
kilonova_2d_3dgrid	8m 58s
nebular_1d_3dgrid	11m 33s
nebular_1d_3dgrid_limitbfest	14m 6s
classicmode_1d_3dgrid testmode ON	21m 7s
classicmode_3d testmode ON	33m 39s
kilonova_1d_1dgrid testmode ON	13m 49s
kilonova_1d_3dgrid testmode ON	15m 35s
kilonova_2d_2dgrid testmode ON	27m 10s
kilonova_2d_2dgrid_barnesthermalisation testmode ON	22m 17s
kilonova_2d_2dgrid_expansionopac testmode ON	21m 1s
kilonova_2d_2dgrid_xcomgammaphotoion testmode ON	21m 38s
kilonova_2d_3dgrid testmode ON	29m 45s
nebular_1d_3dgrid testmode ON	25m 41s
nebular_1d_3dgrid_limitbfest testmode ON	28m 33s
combine_checksums	20s
	5h 52m 40s

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