Fix bugs in the conversion of demo_mecanum.
Fix bugs in the conversion of demo_mecanum.

dariomangoni/chrono,jcmadsen/chrono,tjolsen/chrono,dariomangoni/chrono,armanpazouki/chrono,amelmquist/chrono,rserban/chrono,amelmquist/chrono,dariomangoni/chrono,dariomangoni/chrono,amelmquist/chrono,projectchrono/chrono,armanpazouki/chrono,projectchrono/chrono,projectchrono/chrono,amelmquist/chrono,armanpazouki/chrono,rserban/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,projectchrono/chrono,andrewseidl/chrono,andrewseidl/chrono,armanpazouki/chrono,armanpazouki/chrono,rserban/chrono,tjolsen/chrono,tjolsen/chrono,dariomangoni/chrono,andrewseidl/chrono,jcmadsen/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,armanpazouki/chrono,jcmadsen/chrono,andrewseidl/chrono,projectchrono/chrono,Milad-Rakhsha/chrono,amelmquist/chrono,andrewseidl/chrono,rserban/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,tjolsen/chrono,tjolsen/chrono,Milad-Rakhsha/chrono,rserban/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,projectchrono/chrono,jcmadsen/chrono