SwSelPaintRects: avoid rendering the overlay on Android
SwSelPaintRects: avoid rendering the overlay on Android

It's enough to emit the LOK callbacks, no need to waste resources with
the drawinglayer overlay that would not be shown anyway.

As a side-effect, this also fixes a crash on long push on empty table
cells.

Change-Id: I28e670d91bafcbfac93655a7d161f03670a54cfc

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core