Initialize VideoRoom participant recording state when room recording is active (fixes #2550)

Author: lminiero

plugins/janus_videoroom.c

@@ -7521,6 +7521,7 @@ static void *janus_videoroom_handler(void *data) {
 				/* Is this room recorded, or are we recording this publisher already? */
 				janus_mutex_lock(&participant->rec_mutex);
 				if(videoroom->record || participant->recording_active) {
+					participant->recording_active = TRUE;
 					janus_videoroom_recorder_create(participant, participant->audio, participant->video, participant->data);
 				}
 				janus_mutex_unlock(&participant->rec_mutex);