Render Solid Gridlines while converting Excel to PDF with Go via C++

For compatibility with older versions, Aspose.Cells renders gridlines as dotted lines by default while converting Excel to PDF. However, modern Excel renders gridlines as solid lines.

With the option PdfSaveOptions.PaginatedSaveOptions(PaginatedSaveOptions_Impl* impl), Aspose.Cells can also render gridlines as solid lines.