Vehicle weapons fix #1894

Job	Run time
code-tests (CODE)	4m 43s
map-tests (operation_trebuchet)	1m 56s
code-tests (WEB)	2m 53s
map-tests (slayer)	1m 50s
map-tests (firefight)	1m 44s
map-tests (crusade)	1m 41s
map-tests (stranded)	1m 52s
map-tests (first_contact)	2m 23s
map-tests (ks7_elmsville)	3m 22s
map-tests (ks7_elmsville_spaceodp)	3m 24s
map-tests (base_assault)	2m 6s
map-tests (base_assault_unsc_defend_vs_urf)	2m 10s
map-tests (unsc_achlys)	1m 49s
map-tests (base_assault_neutral_base)	2m 6s
map-tests (base_assault_neutral_base_taurus)	2m 27s
map-tests (geminus_city)	3m 4s
map-tests (geminus_city_urf_active)	3m 9s
map-tests (system_conquest)	8m 11s
	50m 50s

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