Remove last_cross #8637

Job	Run time
classicmode_1d_3dgrid	7m 47s
classicmode_3d	7m 8s
kilonova_1d_1dgrid	4m 27s
kilonova_1d_3dgrid	4m 35s
kilonova_2d_2dgrid	6m 25s
kilonova_2d_2dgrid_barnesthermalisation	4m 54s
kilonova_2d_2dgrid_expansionopac	4m 24s
kilonova_2d_2dgrid_xcomgammaphotoion	4m 52s
kilonova_2d_3dgrid	6m 26s
nebular_1d_3dgrid	11m 10s
nebular_1d_3dgrid_limitbfest	13m 36s
combine_checksums	16s
	1h 16m 0s

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