sys/pm_layered: pm_get_blocker `=` instead of memcopy -ease readability
sys/pm_layered: pm_get_blocker `=` instead of memcopy -ease readability

kaspar030/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,RIOT-OS/RIOT