Tweaks how slowdown applies to humanmobs #1822

Job	Run time
code-tests (CODE)	4m 35s
code-tests (WEB)	3m 0s
map-tests (operation_trebuchet)	2m 23s
map-tests (slayer)	2m 3s
map-tests (firefight)	1m 51s
map-tests (crusade)	1m 44s
map-tests (stranded)	2m 1s
map-tests (first_contact)	2m 46s
map-tests (ks7_elmsville)	3m 37s
map-tests (ks7_elmsville_spaceodp)	3m 32s
map-tests (base_assault)	2m 15s
map-tests (base_assault_unsc_defend_vs_urf)	2m 16s
map-tests (unsc_achlys)	2m 5s
map-tests (base_assault_neutral_base)	2m 15s
map-tests (base_assault_neutral_base_taurus)	2m 22s
map-tests (geminus_city)	3m 19s
map-tests (geminus_city_urf_active)	3m 31s
map-tests (system_conquest)	8m 22s
	53m 57s

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