comments_async: info message wrong

[philli-m]

expected behaviour: members of private and semi public projects should see correct message
behaviour: PhilUser in Opin is listed as a member but sees incorrect message in rating phase 'Only invited users can actively participate.'
Comment/Question: When project is public the message reads 'The currently active phase doesn't allow to comment.'
In all projects see original issue liqd/a4-opin#2525