[AppBar] Add test for iconElementRight gets FlatButton (#6362)
[AppBar] Add test for iconElementRight gets FlatButton (#6362)

* Add a test for iconElementRight gets FlatButton on AppBar to set the style correctly

* Fix style errors

hwo411/material-ui,kittyjumbalaya/material-components-web,mmrtnz/material-ui,ichiohta/material-ui,janmarsicek/material-ui,hai-cea/material-ui,mit-cml/iot-website-source,hwo411/material-ui,igorbt/material-ui,mit-cml/iot-website-source,ichiohta/material-ui,manchesergit/material-ui,kittyjumbalaya/material-components-web,mit-cml/iot-website-source,mmrtnz/material-ui,janmarsicek/material-ui,janmarsicek/material-ui,igorbt/material-ui,janmarsicek/material-ui,manchesergit/material-ui,hai-cea/material-ui