Handle split select rotation

- Update floatingTaskView, apply splitsSelectTranslation and splitPrimaryScorllOffest when rotating while in split select
- Moved getSplitSelectTranslation to RecentsView
- When in portrait, treat STAGE_POSITION_BOTTOM_OR_RIGHT as STAGE_POSITION_TOP_OR_LEFT in split translation calculation
- Apply splitsSelectTranslation for portrait grid too

Fix: 201721153
Test: manual
Change-Id: I768a3b15de4d434674058b274c368798f5852917