Update test infra to allow split placeholder view in all apps

* Previously we assume the split placeholder view shouldn't be
present in any states except launcher split selection, however
with contextual that changes.
* Now we only ensure that view isn't there in all apps when
we are not in split selection.

Test: Test runs and passes locally
Fixes: 323418145
Change-Id: Ida92030f9b139532ebb09c1d2646795bbb940bfc