internal/export/idna: don't remove leading dots Dots are still removed for profiles for which this makes sense. Update golang/go#19821 Change-Id: I3de20bc5ddd943557831d1de998554105d7c07e7 Reviewed-on: https://go-review.googlesource.com/44380 Run-TryBot: Marcel van Lohuizen <mpvl@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Nigel Tao <nigeltao@golang.org>