Skip moving home to front when starting task from recents in multi-window mode

In multi-window mode, home should not move to front when starts task
from resents since it might covers other tasks.

Bug: 400759425
Test: atest com.android.server.wm.ActivityTaskSupervisorTests
Flag: EXEMPT bug fix
Change-Id: If408b0faadf82d2294ed82b560446f0cdab78579