Use schematic editor default font setting for plot job.

When the user does not define a font on the CLI or when plotting from a
job set, use the current schematic editor default font setting rather than
always defaulting to the "KiCad Font".

Set the --default-font CLI setting to an empty string so the the schematic
editor default font setting will be used.  Setting the --default-font CLI
option will override the schematic editor default font setting.

kicad/cli/command_sch_export_plot.cpp

@@ -80,7 +80,7 @@ CLI::SCH_EXPORT_PLOT_COMMAND::SCH_EXPORT_PLOT_COMMAND( const std::string& aName,
 
     m_argParser.add_argument( ARG_FONT_NAME )
             .help( UTF8STDSTR( _( "Default font name" ) ) )
-            .default_value( wxString( KICAD_FONT_NAME ).ToStdString() );
+            .default_value( wxString( "" ).ToStdString() );
 
     if( aPlotFormat == SCH_PLOT_FORMAT::PDF )
     {