Removing support for lagacy shortcuts

> Addition/removal of  shortcus is already removed. This just
  cleans up the unused code path

Bug: 275875209
Test: Updated tests
Flag: N/A
Change-Id: I8ab7f57b693f996920e50e8beecafcffab5167e9

src/com/android/launcher3/model/ItemInstallQueue.java

@@ -286,7 +286,6 @@ public class ItemInstallQueue {
 
                     final WorkspaceItemInfo si = new WorkspaceItemInfo();
                     si.user = user;
-                    si.itemType = ITEM_TYPE_APPLICATION;
 
                     LauncherActivityInfo lai;
                     boolean usePackageIcon = laiList.isEmpty();