[pymtl] fixed minor bug in visualization for GCD
[pymtl] fixed minor bug in visualization for GCD

cfelton/pymtl,Abhinav117/pymtl,12yujim/pymtl,tj93/pymtl,Abhinav117/pymtl,cornell-brg/pymtl,Glyfina-Fernando/pymtl,jjffryan/pymtl,jck/pymtl,Glyfina-Fernando/pymtl,Abhinav117/pymtl,Abhinav117/pymtl,cornell-brg/pymtl,jck/pymtl,tj93/pymtl,jjffryan/pymtl,12yujim/pymtl,cfelton/pymtl,jjffryan/pymtl,cornell-brg/pymtl,12yujim/pymtl,Glyfina-Fernando/pymtl,cfelton/pymtl,jck/pymtl,tj93/pymtl