Fixing memory leak on rebind

Folder listeners were only cleared on activity destroy

Bug: 79322746
Change-Id: I5da98b864855303d21b86511de2e2982cd56f305

src/com/android/launcher3/Workspace.java

@@ -517,6 +517,7 @@ public class Workspace extends PagedView<WorkspacePageIndicator>
         }
 
         // Remove the pages and clear the screen models
+        removeFolderListeners();
         removeAllViews();
         mScreenOrder.clear();
         mWorkspaceScreens.clear();