Revert "Send all MediaWiki updates to #mediawiki-feed too"

Because the current setup is 'if it matches anything, send
it to that channel - else send to #wikimedia-dev', this
change breaks things by sending everything only to -feed, 
neglecting #wikimedia-dev. Thus a more involved change is
required to support this.

This reverts commit 102883ae7e756fd7652df16fc2eba0a9fb633fa2.

Change-Id: I32b83afdb6a0be5e039fb31c8feea1aa89cdddb3