PresenterSlideShowView::PaintInnerWindow has a mbIsForcedPaintPending flag
which is used to throw away the console canvas, but for other backends the
paint occurs at a much different time after a clear has a chance to get
triggered, while for gtk3 it happens as its being setup.

hack around this presenter console weirdness by skipping the initial
paint for this salsysobj case

Change-Id: If1b23600ef07241e52d92bd5eb38b9e90d9ed192