Add the outline back for off switches.

Change-Id: I8b1f0daa454814f8ec51f0331a3521b94b3a6518
Fixes: 322441618
Flag: EXEMPT bugfix
Test: Manual
diff --git a/packages/SystemUI/res/drawable/settingslib_track_off_background.xml b/packages/SystemUI/res/drawable/settingslib_track_off_background.xml
index 3a09284..284953a 100644
--- a/packages/SystemUI/res/drawable/settingslib_track_off_background.xml
+++ b/packages/SystemUI/res/drawable/settingslib_track_off_background.xml
@@ -23,4 +23,5 @@
              android:right="@dimen/settingslib_switch_thumb_margin"/>
     <solid android:color="@color/settingslib_track_off_color"/>
     <corners android:radius="@dimen/settingslib_switch_track_radius"/>
+    <stroke android:width="2dp" android:color="@color/settingslib_track_online_color"/>
 </shape>