Fix Recents regressions

- Remove extra argument from the invocation of Recents from AM/WM, fetching
  the states directly. This also fixes the issue with the docked task from
  showing in Recents since the state will trigger the preloaded task stack
  to be invalidated.
- Move Recents stack update to onStart() to ensure that it is updated with
  the changes introduced in ag/3338461
- Fix an issue with the initial state being clobbered when entering split
  screen

Bug: 70279132
Test: Long press recents button to split screen, verify task is not visible
Change-Id: If5a3ca1d86fa0025d6b1e08abf73fe80a390ef8e