Fix typo in start_web_server, re-enable tests

pkg/intl/test/start_web_server.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * This file starts a trivial HTTP server to serve locale data files. We start
  * it as a separate process, then terminate so that the test can continue to
  * run. See web_server.dart for more information.
  */
 
 #import("dart:io");
 #import("dart:isolate");
 
 main() {
   var thisDir = new File(new Options().script).directorySync();
-  var serverPath = "{$thisDir.path}pkg/intl/test/web_server.dart";
+  var serverPath = "${thisDir.path}/web_server.dart";
   // TODO(alanknight): This uses nohup and & to stop the child process from
   // stopping when we exit. This won't work on Windows.
   var p = Process.start(
       "nohup",
       [new Options().executable, serverPath, "&"]);
   p.onExit = (p) => print("Exited abnormally with exit code: $p");
   // Give the other process a moment to fully start, and give us a meaningful
   // exit code if there's an abnormal exit, before we finish.
   new Timer(1000, (t) => exit(0));
 }