fix typo in balls and sticks rendering
fix typo in balls and sticks rendering

CyrusBiotechnology/pv,yuhangwang/pv,CyrusBiotechnology/pv,yuhangwang/pv,CyrusBiotechnology/pv,yuhangwang/pv,biasmv/pv,CyrusBiotechnology/pv,Traksewt/pv,biasmv/pv,Traksewt/pv,biasmv/pv,Traksewt/pv,yuhangwang/pv,Traksewt/pv,biasmv/pv