give cleaner lines to the scan table (#543)

files/www/cgi-bin/scan

@@ -156,6 +156,9 @@ end
 html.print([[
     <script src="/js/sorttable-min.js"></script>
     <style>
+    table {
+        border-collapse:collapse;
+    }
     table.sortable thead {                                          
         background-color:#eee;                                     
         color:#666666;