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