Don't recreate taskbar in Overview

This cl includes
	- when going to overview from Launcher or Desktop Mode don't recreate taskbar and keep it a same variant as the context user was in.
        - user will still be able to pin/unpin taskbar in overview, but it will be recreated to the launcher context.

Bug: 343882478
Test: Manual
Flag: com.android.window.flags.enable_desktop_windowing_mode

Change-Id: Icb62e1767a83a31422d952ca44fae96ad84ebf44
1 file changed