Defer close of source and sink to prevent error logs. (#2149)

When a room is created via room service, when `StartSession`
runs, it sees a closed request source and returns an error
and that gets logged. It is not a real error.

Defer the sink and source close so that room creation can finish without
errors.

pkg/service/roomservice.go

@@ -84,8 +84,8 @@ func (s *RoomService) CreateRoom(ctx context.Context, req *livekit.CreateRoomReq
 	if err != nil {
 		return nil, err
 	}
-	sink.Close()
-	source.Close()
+	defer sink.Close()
+	defer source.Close()
 
 	// ensure it's created correctly
 	err = s.confirmExecution(func() error {