Remove last_cross #8639

Job	Run time
classicmode_1d_3dgrid	7m 50s
classicmode_3d	7m 5s
kilonova_1d_1dgrid	4m 15s
kilonova_1d_3dgrid	4m 31s
kilonova_2d_2dgrid	6m 18s
kilonova_2d_2dgrid_barnesthermalisation	5m 10s
kilonova_2d_2dgrid_expansionopac	4m 23s
kilonova_2d_2dgrid_xcomgammaphotoion	4m 53s
kilonova_2d_3dgrid	6m 26s
nebular_1d_3dgrid	11m 19s
nebular_1d_3dgrid_limitbfest	13m 24s
combine_checksums	17s
	1h 15m 51s

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