conversationmodel: fix readOnly detection
conversationmodel: fix readOnly detection

This makes sense only in one to one. For swarm, there will be no
read only as we can add a new conversation member. Also, we should
not see readOnly = true for conversations with self.

Change-Id: Ic404a6b58e7812fedfe2fede91beb77b44436526
GitLab: https://git.jami.net/savoirfairelinux/ring-project/-/issues/1282

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc