net/http: revert h2_bundle.go formatting change from CL 368254

h2_bundle.go is automatically generated from x/net/http2. Any
formatting changes within that file need to be first made upstream.

This brings the contents of h2_bundle.go back in line with the
upstream generator, fixing the cmd/internal/moddeps test that is
currently failing on the longtest builders.

For #49884

Change-Id: I5757240b77e250e0026b8a52a0e867e1578ec2d4
Reviewed-on: https://go-review.googlesource.com/c/go/+/371297
Trust: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>