Fix for scroll on small screen devices,
Fix for scroll on small screen devices,

ms-Dropdown-items should always have "overflow-y: scroll, not only on screen sizes above 480px.
waldekmastykarz/Office-UI-Fabric,kissstudio/Office-UI-Fabric,zkoehne/Office-UI-Fabric,waldekmastykarz/Office-UI-Fabric,OfficeDev/Office-UI-Fabric,OfficeDev/Office-UI-Fabric,kissstudio/Office-UI-Fabric,zkoehne/Office-UI-Fabric