[Drawer] Fix right chevron in persistent demo (#13275)
[Drawer] Fix right chevron in persistent demo (#13275)

* Fix right chevron in persistent drawer demo

When 'right' is selected, the right chevron is properly displayed and positioned.

* let's merge

callemall/material-ui,lgollut/material-ui,rscnt/material-ui,Kagami/material-ui,mui-org/material-ui,kybarg/material-ui,mbrookes/material-ui,mbrookes/material-ui,kybarg/material-ui,kybarg/material-ui,oliviertassinari/material-ui,Kagami/material-ui,Kagami/material-ui,callemall/material-ui,oliviertassinari/material-ui,callemall/material-ui,mbrookes/material-ui,rscnt/material-ui,mui-org/material-ui,rscnt/material-ui,allanalexandre/material-ui,oliviertassinari/material-ui,callemall/material-ui,mui-org/material-ui,kybarg/material-ui,Kagami/material-ui