fix(cmd/mostliked): don't close jetstreamEvents and close websocket first

cmd/mostliked/main.go

···
 	go func(conn *websocket.Conn, dbCnx *sql.DB, jetstreamEvents chan []byte) {
 		<-signalChan
 		log.Println("shutting down...")
-		close(jetstreamEvents)
+		conn.Close()
 		dbCnx.Close()
-		conn.Close()
 		close(cleanupDone)
 	}(conn, dbCnx, jetstreamEvents)