Render Solid Gridline while converting Excel to PDF with Golang 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 nowadays.

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