cmd/golangorg: fixup -tags prod for internal/web
cmd/golangorg: fixup -tags prod for internal/web

prod.go is build-tagged away and not updated by rf.

Change-Id: I40a655586ff9e019cccdf82ca96b25c6b80e383d
Reviewed-on: https://go-review.googlesource.com/c/website/+/317657
Trust: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Run-TryBot: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@golang.org>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website