[FIX] mail: unfollow buttons for portal users

The route `/mail/unfollow` is used by the button
`Unfollow` in the mail notification template so a user
can remove himself from the followers of a thread.

To be able to remove yourself from the followers,
you need to have the write access on the thread
(see `message_unsubscribe` in `mail/mail_tread.py`)
which you perhaps do not have, for instance if you
are a portal user.

The unsubscribe of this follower from the thread
should therefore be done as sudo.

opw-659295

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