Home tasks inherit split or fullscreen from parent.

Also, changes the "inheritance" of bounds-based configs so
that when the window bounds are overridden, the configs will
implicitly also be overridden (recalculated against display)
appBounds and screenW/H match the overridden bounds.

Bug: 154331729
Bug: 153662925
Test: enter split-screen, open ime in launcher. Updated some
      tests to check for this expectation.
Change-Id: I1e37d8d116fde90428036bc54a2a77b293cee338