Update minor code style in ConstraintSolver::removeSkeleton(~)
Update minor code style in ConstraintSolver::removeSkeleton(~)

dartsim/dart,axeisghost/DART6motionBlur,dartsim/dart,dartsim/dart,dartsim/dart,axeisghost/DART6motionBlur,dartsim/dart,axeisghost/DART6motionBlur