Move existing minimized tasks behind Home on fullscreen task launch

Recently we started moving the Home task behind other Desktop tasks on
fullscreen task launch, with this CL we also move existing minimized
tasks behind Home.

Fixes: 357638060
Flag: com.android.window.flags.enable_desktop_windowing_task_limit
Test: DesktopTasksControllerTest
Change-Id: I4660d6fe965fb1720b812315f43fcd72594bd35f