Make settings cog animate back to original button

Provide the appropriate itemInfo so that launcherBackAnimation would play correctly.

bug:324569690
Test manual video: https://drive.google.com/file/d/1GfjL4PhdGOxs2KfDpieTNiFiKQ61aCgh/view?usp=sharing
Flag: ACONFIG com.android.launcher3.Flags.enable_private_space trunkfood

Change-Id: I1a9458643e932b279bf4ba4ea33e3dc0a2c121c2
diff --git a/src/com/android/launcher3/LauncherSettings.java b/src/com/android/launcher3/LauncherSettings.java
index 84b8ba1..87ac193 100644
--- a/src/com/android/launcher3/LauncherSettings.java
+++ b/src/com/android/launcher3/LauncherSettings.java
@@ -183,6 +183,7 @@
         public static final int CONTAINER_SHORTCUTS = -107;
         public static final int CONTAINER_SETTINGS = -108;
         public static final int CONTAINER_TASKSWITCHER = -109;
+        public static final int CONTAINER_PRIVATESPACE = -110;
 
         // Represents any of the extended containers implemented in non-AOSP variants.
         public static final int EXTENDED_CONTAINERS = -200;