Resolves: tdf#160392 preview's measurement are black on dark bg in dark mode

Change-Id: I538750ef7d20ecc17a60ce47989eeaf0390a0103
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165414
Tested-by: Jenkins
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
(cherry picked from commit d3ed3836cbec932f8a381fcb2c85787fb0f8b766)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/165423
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
diff --git a/vcl/source/window/printdlg.cxx b/vcl/source/window/printdlg.cxx
index 4ea3c6c..a9a0ba1 100644
--- a/vcl/source/window/printdlg.cxx
+++ b/vcl/source/window/printdlg.cxx
@@ -122,7 +122,7 @@ void PrintDialog::PrintPreviewWindow::Paint(vcl::RenderContext& rRenderContext, 
{
    rRenderContext.Push();
    weld::SetPointFont(rRenderContext, rRenderContext.GetSettings().GetStyleSettings().GetLabelFont());

    rRenderContext.SetTextColor(rRenderContext.GetSettings().GetStyleSettings().GetLabelTextColor());
    rRenderContext.SetBackground(Wallpaper(Application::GetSettings().GetStyleSettings().GetDialogColor()));
    rRenderContext.Erase();