Remove outdated comment

As tested by @3nids, QPrinter::PdfFormat works correctly on OSX
(as of Qt 5.11) and correctly respects "text as text" setting
without forcing conversion to paths.

(cherry picked from commit 20e6ace)

src/core/layout/qgslayoutexporter.cpp

@@ -1024,13 +1024,6 @@ QgsLayoutExporter::ExportResult QgsLayoutExporter::exportToSvg( QgsAbstractLayou
 void QgsLayoutExporter::preparePrintAsPdf( QgsLayout *layout, QPrinter &printer, const QString &filePath )
 {
   printer.setOutputFileName( filePath );
-  // setOutputFormat MUST come after setOutputFileName, which auto-sets format to QPrinter::PdfFormat.
-
-  // [LS] This should be QPrinter::NativeFormat for Mac, otherwise fonts are not embed-able
-  // and text is not searchable; however, there are several bugs with <= Qt 4.8.5, 5.1.1, 5.2.0:
-  // https://bugreports.qt.io/browse/QTBUG-10094 - PDF font embedding fails
-  // https://bugreports.qt.io/browse/QTBUG-33583 - PDF output converts text to outline
-  // Also an issue with PDF paper size using QPrinter::NativeFormat on Mac (always outputs portrait letter-size)
   printer.setOutputFormat( QPrinter::PdfFormat );
 
   updatePrinterPageSize( layout, printer, firstPageToBeExported( layout ) );