Add two extra empty pages on two panel launcher home

Add a new screen ID for the second extra empty page
and add that new screen as well when the existing
extra empty page is added so that users can put items
on both sides of Workspace.

Test: manual
Bug: 196376162
Change-Id: I0b4f2e818407a10d8a7c032788a7bd7a61267779

src/com/android/launcher3/accessibility/ShortcutMenuAccessibilityDelegate.java

@@ -68,6 +68,9 @@ public class ShortcutMenuAccessibilityDelegate extends LauncherAccessibilityDele
             final WorkspaceItemInfo info = ((DeepShortcutView) host.getParent()).getFinalInfo();
             final int[] coordinates = new int[2];
             final int screenId = findSpaceOnWorkspace(item, coordinates);
+            if (screenId == -1) {
+                return false;
+            }
             mLauncher.getStateManager().goToState(NORMAL, true, forSuccessCallback(() -> {
                 mLauncher.getModelWriter().addItemToDatabase(info,
                         LauncherSettings.Favorites.CONTAINER_DESKTOP,