test: remove TODO

It's not clear what additional tests are wanted.
The current malformed URL test seems adequate.

PR-URL: https://github.com/nodejs/io.js/pull/1875
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>

test/parallel/test-http-malformed-request.js

@@ -28,8 +28,6 @@ server.on('listening', function() {
     c.write('GET /hello?foo=%99bar HTTP/1.1\r\n\r\n');
     c.end();
   });
-
-  // TODO add more!
 });
 
 process.on('exit', function() {