[enh] only display ffdn members in embeded map

ffdnispdb/templates/site_embed.js

@@ -320,6 +320,8 @@ function init_map() {
             if(!('coordinates' in isp))
                 return; // cannot display an ISP without coordinates
 
+            if (!isp.ffdn_member) return;
+
             var marker = L.marker([isp['coordinates']['latitude'], isp['coordinates']['longitude']],
                                   {'icon': isp.ffdn_member ? icon_ffdn : icon});