Change options corner radius to applied style 2/2

 - Change the corner radius from 8dp to applied style, will impact
 Style, Grid and Clock tab's options, https://docs.google.com/presentation/d/15JadcGi5k1_0znUN_XdFpU7UxeXwxjK3Y7LxvhW5ETM/edit?ts=5ec60161#slide=id.g7c8f4a82bf_0_60
 - Screenshots: https://screenshot.googleplex.com/fcArOYdke1O.png
 https://screenshot.googleplex.com/iY04EkneEae.png
 https://screenshot.googleplex.com/YPdWJAgoTMA.png

Change-Id: Ida3ad3a631942cef56f14f8e4c475db7ea6f0806