Update _appRooms to only include public rooms

[Biebras]

This pull request updates the _appRooms property to only include public rooms. Previously, the _appRooms property included all rooms, regardless of whether they were public or private. This change adds a Where clause to the _appRooms property to filter out private rooms, ensuring that only public rooms are included.

[Speidy674]

looks like i forgot to add the where clause xD