examples/asymcute: fix short and predefined topics
examples/asymcute: fix short and predefined topics

kYc0o/RIOT,jasonatran/RIOT,kYc0o/RIOT,miri64/RIOT,kaspar030/RIOT,miri64/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,authmillenon/RIOT,kYc0o/RIOT,jasonatran/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kaspar030/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,ant9000/RIOT,miri64/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,ant9000/RIOT,OlegHahm/RIOT,jasonatran/RIOT,authmillenon/RIOT,miri64/RIOT,OTAkeys/RIOT,ant9000/RIOT,authmillenon/RIOT,miri64/RIOT,OlegHahm/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,authmillenon/RIOT,ant9000/RIOT,jasonatran/RIOT,authmillenon/RIOT,jasonatran/RIOT