Fix incorrect task bounds when launching apps into split-screen

In some cases, we may need restore a recent task while starting an
app into split-screen mode. Since the recent task has override bounds
(such as previously in freefrom mode), causing the task displayed
incorrectly in split-screen.

Ensure the empty bounds is properly set while launching the app and
the empty bounds are honored in WM Core.

Bug: 416441150
Test: steps on the bug
Flag: com.android.window.flags.fix_layout_restored_task

Change-Id: I112caf8ea0bc39cc0222bd2e79e384735ad24e6c