ios: add type for cloneConversation

If iOS is in deep sleep mode, it will only wake up the daemon if
a new activity needs to be shown (call, message or contact).
If the peer accepts a trust request, it will clone and join the
conversation (so a new message will be shown). So, cloning
a conversation should notify the iOS device that the daemon MUST
be started.

GitLab: #776
Change-Id: I639a5f928fec2970909a29b9f3c33c165ac201c8