Update RadioButtonPreference widget layout

 - Adjust widget padding
 Screenshots:
   https://screenshot.googleplex.com/92NGNQa8pqrqns7.png
   https://screenshot.googleplex.com/BpcrhseYHMRxtn9.png
   https://screenshot.googleplex.com/ATmVmgiKV3CLYQH.png

Bug: 187778673
Test: atest RadioButtonPreferenceTest
Change-Id: I060489ccb875f3820d486b52795b313cb6ff9db2
1 file changed