gmod_src: Fixed ImpactTrace not being called for SENTs

Revision 938
Fixed ImpactTrace not being called for SENTs Changed Files:
[ul]
[li]trunk/src_garrysmod/game/shared/garrysmod/scripted_entities/sent_anim.cpp [/li][li]trunk/src_garrysmod/game/shared/garrysmod/scripted_entities/sent_anim.h[/li][/ul]

Committed By Garry Newman