favorite group duplicate

[Maskass57]

2 groups with the same name is not normal, one existed before the group renaming feature and one was added after (and it should not have been possible)

The group existing before is not correct (wrong calendar).

Possibly related to #127

[ignyx]

They might not have the same Id, try console.logging the metadata. Have you identified the steps to reproduce this bug ?

Possibly related to #127