Resolves: tdf128672 nup missing erase of old content

Change-Id: Ib00d7aeb5911e071cd8f1c8cd79574e194b87d98
Reviewed-on: https://gerrit.libreoffice.org/82299
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/source/window/printdlg.cxx b/vcl/source/window/printdlg.cxx
index 7692424..87d578c 100644
--- a/vcl/source/window/printdlg.cxx
+++ b/vcl/source/window/printdlg.cxx
@@ -442,6 +442,8 @@ void PrintDialog::ShowNupOrderWindow::Paint(vcl::RenderContext& rRenderContext, 
{
    rRenderContext.SetMapMode(MapMode(MapUnit::MapPixel));
    rRenderContext.SetTextColor(rRenderContext.GetSettings().GetStyleSettings().GetFieldTextColor());
    rRenderContext.SetBackground(Wallpaper(Application::GetSettings().GetStyleSettings().GetFieldColor()));
    rRenderContext.Erase();

    int nPages = mnRows * mnColumns;
    Font aFont(rRenderContext.GetSettings().GetStyleSettings().GetFieldFont());