Update theme picker option colors

Fixes: 132810518
Change-Id: I63e671619856b79daaadeb44e891f79f85f9b715
diff --git a/res/layout/custom_theme_option.xml b/res/layout/custom_theme_option.xml
index 09bd58e..c91cbf1 100644
--- a/res/layout/custom_theme_option.xml
+++ b/res/layout/custom_theme_option.xml
@@ -33,7 +33,7 @@
         android:layout_gravity="center_horizontal"
         android:paddingHorizontal="@dimen/option_tile_padding_horizontal"
         android:paddingVertical="@dimen/option_tile_padding_vertical"
-        android:background="@drawable/option_border">
+        android:background="@drawable/option_border_custom">
         <ImageView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"