Ensure that we're animating the current live tasks when going back

- The other call to launch tasks animated doesn't work for the current
  task you swiped from when in split.

http://recall/-/g6hkB0pXjyQSvfA8STqRAT/bKHWGjhf2yQVpmRkvn3aeD

Bug: 223750399
Test: Enter overview, swipe back
Test: Enter overview from split, swipe back
Change-Id: Icbe2944df2bb382e072c2890001d7eae505a7b04