Update update_grid.cc #5645

Job	Run time
classicmode_1d_3dgrid	5m 43s
classicmode_3d	9m 6s
kilonova_1d_1dgrid	3m 38s
kilonova_1d_3dgrid	3m 44s
kilonova_2d_2dgrid	6m 3s
kilonova_2d_3dgrid	6m 52s
nebularonezone_1d_3dgrid	7m 16s
nebularonezone_1d_3dgrid_limitbfest	9m 11s
classicmode_1d_3dgrid testmode ON	15m 34s
classicmode_3d testmode ON	21m 13s
kilonova_1d_1dgrid testmode ON	5m 56s
kilonova_1d_3dgrid testmode ON	6m 17s
kilonova_2d_2dgrid testmode ON	11m 34s
kilonova_2d_3dgrid testmode ON	12m 1s
nebularonezone_1d_3dgrid testmode ON	12m 21s
nebularonezone_1d_3dgrid_limitbfest testmode ON	15m 49s
combine_checksums	52s
	2h 33m 10s

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