Update update_grid.cc #5639

Job	Run time
classicmode_1d_3dgrid	1m 24s
classicmode_3d	1m 39s
kilonova_1d_1dgrid	1m 33s
kilonova_1d_3dgrid	1m 28s
kilonova_2d_2dgrid	1m 25s
kilonova_2d_3dgrid	1m 23s
nebularonezone_1d_3dgrid	1m 33s
nebularonezone_1d_3dgrid_limitbfest	1m 40s
classicmode_1d_3dgrid testmode ON	39s
classicmode_3d testmode ON	43s
kilonova_1d_1dgrid testmode ON	35s
kilonova_1d_3dgrid testmode ON	39s
kilonova_2d_2dgrid testmode ON	43s
kilonova_2d_3dgrid testmode ON	48s
nebularonezone_1d_3dgrid testmode ON	35s
nebularonezone_1d_3dgrid_limitbfest testmode ON	37s
combine_checksums	17s
	17m 41s

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