Fully remove when.js dependency

test/unit/@node-red/registry/lib/resources/local/TestNode3/TestNode3.js

@@ -1,8 +1,7 @@
 // A test node that exports a function which returns a rejecting promise
 
-var when = require("when");
 module.exports = function(RED) {
-    return when.promise(function(resolve,reject) {
+    return new Promise(function(resolve,reject) {
         reject("fail");
     });
 }