http2: fix flaky TestTransportReqBodyAfterResponse_403

Removes a time.Sleep from a test.

Fixes golang/go#16102

Change-Id: Ic1079ad3312d2dcfde4cc16dd0ee9661e1e509f2
Reviewed-on: https://go-review.googlesource.com/24903
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed