Revert "Remove redundant a11y announcement upon removal of workspace item."

This reverts commit 556db6df04.

Reason for revert: Droidmonitor created revert due to b/379322118. Will be verifying through ABTD before submission.

Change-Id: Iece717248c63b3b8dabcdf1c413309d24f51c37f

src/com/android/launcher3/DeleteDropTarget.java

@@ -130,6 +130,7 @@ public class DeleteDropTarget extends ButtonDropTarget {
     public void completeDrop(DragObject d) {
         ItemInfo item = d.dragInfo;
         if (canRemove(item)) {
+            onAccessibilityDrop(null, item);
             mDropTargetHandler.onDeleteComplete(item);
         }
     }