Fix split tests for devices with left/right split in portrait

- Update tests to reflect left/right split changes for certain
  device types

Bug: 398918267
Flag: EXEMPT bugfix
Test: Test with phones/landscape-foldables/portrait-foldables:
Test: atest com.android.wm.shell.SwitchAppByDoubleTapDividerGesturalNavLandscape
Test: atest com.android.wm.shell.SwitchAppByDoubleTapDividerGesturalNavPortrait
Change-Id: Iddd4f39a7a3e673a72f9bee13528a5f43d156d13