Update update_grid.cc #5648

Job	Run time
classicmode_1d_3dgrid	5m 50s
classicmode_3d	8m 50s
kilonova_1d_1dgrid	3m 58s
kilonova_1d_3dgrid	3m 52s
kilonova_2d_2dgrid	5m 52s
kilonova_2d_3dgrid	6m 43s
nebularonezone_1d_3dgrid	7m 15s
nebularonezone_1d_3dgrid_limitbfest	8m 43s
classicmode_1d_3dgrid testmode ON	15m 45s
classicmode_3d testmode ON	21m 0s
kilonova_1d_1dgrid testmode ON	5m 42s
kilonova_1d_3dgrid testmode ON	6m 24s
kilonova_2d_2dgrid testmode ON	11m 33s
kilonova_2d_3dgrid testmode ON	12m 20s
nebularonezone_1d_3dgrid testmode ON	12m 16s
nebularonezone_1d_3dgrid_limitbfest testmode ON	15m 4s
combine_checksums	1m 10s
	2h 32m 17s

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