Break split on any non-active change where tasks aren't all TO_FRONT or TO_BACK

* The previous fix here (ag/31195717) regressed the original
issue where calculator and another app is open in unfolded and user
folds the device and only calculator shows up w/ half a black screen.
* Shell transitions gives us a WAKE transition in the case where we
remain unfolded and just lock/unlock the device but doesn't do so
when we fold the device. We can't specifically rely on the WAKE check.
* Now whenever split is already active, if the stages in the animation
aren't all TO_FRONT or TO_BACK we'll break split.

Test: lock/unlock case w/ calculator correctly breaks split +
fold case w/ calculator breaks split. Tried opening a link from Gmail
to ensure one stage where nothing changes and where another stage changes
doesn't break split
Flag: EXEMPT bug fix
Fixes: 387227528

Change-Id: Ib7d1a5a251af0951e8bbbab63aff81c793981f12