Fix update channels for latest Balrog changes. (#29)

This is for issue #29 
Just to make sure why those have been added. When issue was opened, it was requested, nothing regards the dashboard channels has been mentioned: https://github.com/mozilla/mciconf/issues/29#issue-43229082
Otherwise in comment [bug 986990 comment 4](https://bugzilla.mozilla.org/show_bug.cgi?id=986990#c4) where the channels that have been updated are listed we had those too so it was at least confusing for me, I couldn't chose what needs to be added or removed.
By the last comment it was clear enough so I leaved exactly the channels we have for dashboard.