So that bot_update can apply patched on top of experimental branches,
which include the user's email (and so an extra @).

Change-Id: I33acb49e8b48c6ed6db7e752fca7eb0f1ede0690
Reviewed-on: https://chromium-review.googlesource.com/c/1450895
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>