Fix incorrect gerber job file syntax, when a board has inner layers.

pcbnew/exporters/gerber_jobfile_writer.cpp

@@ -541,19 +541,17 @@ void GERBER_JOBFILE_WRITER::addJSONDesignRules()
                             minclearanceOuter*m_conversionUnits ) );
 
     removeJSONSepararator();    // remove the last separator
-    closeBlock();
+
+    if( !hasInnerLayers )
+        closeBlock();
+    else
+        closeBlockWithSep();
 
 
     if( hasInnerLayers )
     {
-        closeBlockWithSep();
-
         openBlock();
         addJSONObject( "\"Layers\": \"Inner\",\n" );
-
-        addJSONObject( "\"Values\":\n" );
-        openBlock();
-
         addJSONObject( wxString::Format( "\"PadToPad\":  %.3f,\n", minPadClearanceInner*m_conversionUnits ) );
         addJSONObject( wxString::Format( "\"PadToTrack\":  %.3f,\n", minPadClearanceInner*m_conversionUnits ) );
         addJSONObject( wxString::Format( "\"TrackToTrack\":  %.3f,\n", minclearance_track2track*m_conversionUnits ) );