Fix GetFeedback reference error

FeedbackStorage uses a room object to store feedback data. The room object was loaded from two different sources, FeedbackStorage and RoomService. Therefore, two different references where used which resulted in a soft reset for feedback when a user requests to GetFeedback after the room's feedback was locked and unlocked again. Fix by creating a fake room object to only hold roomId.

!Closes #82 (closed)