Update drop target styling based for BC.

Spec: https://docs.google.com/presentation/d/1UxdDh8EFhPbdRWRwzjbpgL-j02ew4Ew3eG3XBCeoYdo/edit#slide=id.vXfwHn8

Demo: https://drive.google.com/file/d/1ZIa3Dgo85vdVkfPm7aGJDyctZQR_c8Xx/view?usp=sharing

Test: manual
Bug: 184713740
Change-Id: I17dbbf1f7bbc40939cfc0fedb506a35f39ecc2e3
diff --git a/src/com/android/launcher3/DeleteDropTarget.java b/src/com/android/launcher3/DeleteDropTarget.java
index e46aad2..80ec192 100644
--- a/src/com/android/launcher3/DeleteDropTarget.java
+++ b/src/com/android/launcher3/DeleteDropTarget.java
@@ -53,7 +53,7 @@
     @Override
     protected void onFinishInflate() {
         super.onFinishInflate();
-        setDrawable(R.drawable.ic_remove_shadow);
+        setDrawable(R.drawable.ic_remove_no_shadow);
     }
 
     @Override