fix: add missing comma after date column in CSV export

Author: lettimepassby

backend/framework/src/main/java/org/jumpserver/chen/framework/console/dataview/export/DataExport.java

@@ -141,6 +141,7 @@ public void exportData(String path, DataViewData data) throws Exception {
                 } else if (obj instanceof Date) {
                     SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                     writeString(writer, fmt.format(obj));
+                    writer.write(",");
                 } else {
                     writeString(writer, row.get(field.getName()));
                     writer.write(",");