Make SwitchPreference switch more Material

- remove the padding so that we behave the same way as the CheckBoxPreference

See bug: #13140648 Settings needs to support the new Quantum Paper theme

Change-Id: Ie22f389820c4a48bcf4b018d7009a07140cb493b

core/res/res/layout/preference_widget_switch.xml

@@ -20,6 +20,5 @@
     android:id="@+android:id/switchWidget"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:padding="16dip"
     android:focusable="false"
     android:background="@null" />