Add shadow to "Don't suggest app" drop target

Bug: 142753423
Change-Id: I909409f68bd9a4a04d13a8470a0b65823f42eca7
diff --git a/src/com/android/launcher3/SecondaryDropTarget.java b/src/com/android/launcher3/SecondaryDropTarget.java
index 2430d5e..983c289 100644
--- a/src/com/android/launcher3/SecondaryDropTarget.java
+++ b/src/com/android/launcher3/SecondaryDropTarget.java
@@ -108,7 +108,7 @@
             updateText(R.string.uninstall_drop_target_label);
         } else if (action == DISMISS_PREDICTION) {
             mHoverColor = Themes.getColorAccent(getContext());
-            setDrawable(R.drawable.ic_block);
+            setDrawable(R.drawable.ic_block_shadow);
             updateText(R.string.dismiss_prediction_label);
         } else if (action == RECONFIGURE) {
             mHoverColor = Themes.getColorAccent(getContext());