forcegraph: increase visibility of unknown nodes

lib/forcegraph.js

@@ -314,7 +314,7 @@ define(["d3"], function (d3) {
 
       var clientColor = "#E6324B"
       var hilightColor = "#FA940F"
-      var unknownColor = "#353634"
+      var unknownColor = "#D10E2A"
       var nodeColor = "#F2E3C6"
 
       ctx.fillStyle = clientColor