Revert "Update thermalbalance.cc" #7507

Job	Run time
classicmode_1d_3dgrid	4m 22s
classicmode_3d	8m 3s
kilonova_1d_1dgrid	4m 10s
kilonova_1d_3dgrid	4m 32s
kilonova_2d_2dgrid	6m 48s
kilonova_2d_2dgrid_barnesthermalisation	4m 44s
kilonova_2d_2dgrid_expansionopac	4m 47s
kilonova_2d_2dgrid_xcomgammaphotoion	5m 55s
kilonova_2d_3dgrid	6m 37s
nebular_1d_3dgrid	11m 22s
nebular_1d_3dgrid_limitbfest	13m 57s
classicmode_1d_3dgrid testmode ON	14m 21s
classicmode_3d testmode ON	22m 1s
kilonova_1d_1dgrid testmode ON	9m 33s
kilonova_1d_3dgrid testmode ON	9m 56s
kilonova_2d_2dgrid testmode ON	17m 11s
kilonova_2d_2dgrid_barnesthermalisation testmode ON	15m 13s
kilonova_2d_2dgrid_expansionopac testmode ON	13m 30s
kilonova_2d_2dgrid_xcomgammaphotoion testmode ON	14m 15s
kilonova_2d_3dgrid testmode ON	18m 23s
nebular_1d_3dgrid testmode ON	24m 24s
nebular_1d_3dgrid_limitbfest testmode ON	27m 24s
combine_checksums	16s
	4h 21m 44s

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