Move open-braces up to the prior line in RigidBodySystem.cpp.
Move open-braces up to the prior line in RigidBodySystem.cpp.

sheim/drake,billhoffman/drake,billhoffman/drake,billhoffman/drake,billhoffman/drake,sheim/drake,sheim/drake,sheim/drake,billhoffman/drake,sheim/drake,sheim/drake,billhoffman/drake,sheim/drake,billhoffman/drake,billhoffman/drake,sheim/drake