[milo] Fix duplicate builders in console
[milo] Fix duplicate builders in console

Bug: 834198
Change-Id: I33596cf7ff39be01fd0b50c1b50d82f06f820383
Reviewed-on: https://chromium-review.googlesource.com/1020286
Reviewed-by: Michael Knyszek <4473450dc5c88f06e1fb787f303d7805ec2aee65@google.com>
Commit-Queue: Ryan Tseng <2190fe9a39b4920ec7bd59c848ec5cccd163056f@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go