Fix kicad-cli pcb export pdf --mode-multipage

So it generates one PDF instead of multiple PDFs

Author: set-soft

kicad/cli/command_pcb_export_pdf.cpp

@@ -174,7 +174,10 @@ int CLI::PCB_EXPORT_PDF_COMMAND::doPerform( KIWAY& aKiway )
     pdfJob->m_argCommonLayers = From_UTF8( m_argParser.get<std::string>( ARG_COMMON_LAYERS ).c_str() );
 
     if( argModeMulti )
+    {
         pdfJob->m_pdfGenMode = JOB_EXPORT_PCB_PDF::GEN_MODE::ONE_PAGE_PER_LAYER_ONE_FILE;
+        pdfJob->m_pdfSingle = true;
+    }
     else if( argModeSeparate )
         pdfJob->m_pdfGenMode = JOB_EXPORT_PCB_PDF::GEN_MODE::ALL_LAYERS_SEPARATE_FILE;
     else if( argModeSingle )