Add visual indicator for predicted hotseat icons

Bug: 142753423
Test: Manual
Change-Id: Ie4325660fc5392358ec845ae58385bef279db60f
diff --git a/src/com/android/launcher3/BubbleTextView.java b/src/com/android/launcher3/BubbleTextView.java
index 01e9b6e..e6f8a85 100644
--- a/src/com/android/launcher3/BubbleTextView.java
+++ b/src/com/android/launcher3/BubbleTextView.java
@@ -216,6 +216,7 @@
         cancelDotScaleAnim();
         mDotParams.scale = 0f;
         mForceHideDot = false;
+        setBackground(null);
     }
 
     private void cancelDotScaleAnim() {