beam tracer fix #1777

Job	Run time
code-tests (CODE)	4m 48s
map-tests (operation_trebuchet)	1m 59s
code-tests (WEB)	3m 5s
map-tests (slayer)	1m 54s
map-tests (firefight)	1m 47s
map-tests (crusade)	1m 39s
map-tests (stranded)	2m 6s
map-tests (first_contact)	3m 13s
map-tests (ks7_elmsville)	3m 26s
map-tests (ks7_elmsville_spaceodp)	3m 21s
map-tests (base_assault)	2m 13s
map-tests (base_assault_unsc_defend_vs_urf)	2m 26s
map-tests (unsc_achlys)	2m 11s
map-tests (base_assault_neutral_base)	2m 21s
map-tests (base_assault_neutral_base_taurus)	2m 20s
map-tests (geminus_city)	3m 47s
map-tests (geminus_city_urf_active)	3m 24s
map-tests (system_conquest)	8m 31s
	54m 31s

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