Remove the ripple effect of the switch button

There's already ripple on the list item.

Screenshots:
  Before(ripple): https://screenshot.googleplex.com/5ma7QCet9jeqehW.png
  After(no ripple): https://screenshot.googleplex.com/XFFmPPEqQaiEvEa.png

Bug: 191614840
Test: manual
Change-Id: I6cb7582fe7a3cb9481338f54570dd54d551bcb9c
diff --git a/res/layout/dark_mode_section_view.xml b/res/layout/dark_mode_section_view.xml
index d63f07a..b9ab0e3 100644
--- a/res/layout/dark_mode_section_view.xml
+++ b/res/layout/dark_mode_section_view.xml
@@ -37,6 +37,7 @@
         android:id="@+id/dark_mode_toggle"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:background="@null"
         android:clickable="false"
         android:focusable="false"
         style="@style/Switch.SettingsLib" />
diff --git a/res/layout/themed_icon_section_view.xml b/res/layout/themed_icon_section_view.xml
index cd4268c..80e617d 100644
--- a/res/layout/themed_icon_section_view.xml
+++ b/res/layout/themed_icon_section_view.xml
@@ -37,6 +37,7 @@
         android:id="@+id/themed_icon_toggle"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:background="@null"
         android:clickable="false"
         android:focusable="false"
         style="@style/Switch.SettingsLib"/>