[FIX] mail: restrict mention suggestions to channel members

Problem is that when someone is mentionned in a channel he doesn't belong to
(public, private or DM whatever), the message only appears in its Inbox and
he can't know where it comes from nor reply. This is thus very confusing.

With this rev., in Discuss, one can only mention members of the channels.
In the chatter, anyone can be mentionned like before, as when the message
arrives in the Inbox, there is a link to the associated document.

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