fix sidebar toc ordered-list number > 10 alignment problem
fix sidebar toc ordered-list number > 10 alignment problem

FinalTheory/pelican-theme,mawenbao/niu-x2-sidebar,FinalTheory/pelican-theme,whypro/niu-x2-sidebar,whypro/niu-x2-sidebar,FinalTheory/pelican-theme,mawenbao/niu-x2-sidebar