Restore time_zone_item ripple effect

Change-Id: I56d9e159657c56d5eb26b5d9553662cbb036deae
diff --git a/res/layout/time_zone_item.xml b/res/layout/time_zone_item.xml
index 1933712..92fcb18 100644
--- a/res/layout/time_zone_item.xml
+++ b/res/layout/time_zone_item.xml
@@ -20,6 +20,7 @@
     android:layout_height="wrap_content"
     android:layout_gravity="center_vertical"
     android:background="?android:attr/itemBackground"
+    android:foreground="?android:attr/selectableItemBackground"
     android:gravity="center_vertical"
     android:orientation="vertical"
     android:paddingLeft="20dp"