test: remove timer from test-http-1.0

It's possible that the `end` event is emitted after the timeout fires
causing the test to fail. Just remove the timer. If for some reason the
`end` would never fire, the test will fail with a timeout.

PR-URL: https://github.com/nodejs/node/pull/5129


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>