[luci-notify] Fix cron.yaml indentation
[luci-notify] Fix cron.yaml indentation

TBR=tandrii@chromium.org

Bug: 826545
Change-Id: Ib4823b7fae948396cd27a0890124a6d8a8a37087
Reviewed-on: https://chromium-review.googlesource.com/c/1268675
Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>

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