examples/nanocoap: use refactored block control function
examples/nanocoap: use refactored block control function

basilfx/RIOT,mtausig/RIOT,yogo1212/RIOT,rfuentess/RIOT,cladmi/RIOT,jasonatran/RIOT,josephnoir/RIOT,x3ro/RIOT,RIOT-OS/RIOT,kaspar030/RIOT,ant9000/RIOT,basilfx/RIOT,authmillenon/RIOT,kYc0o/RIOT,miri64/RIOT,OTAkeys/RIOT,ant9000/RIOT,kaspar030/RIOT,kaspar030/RIOT,aeneby/RIOT,basilfx/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,yogo1212/RIOT,yogo1212/RIOT,cladmi/RIOT,authmillenon/RIOT,OTAkeys/RIOT,x3ro/RIOT,aeneby/RIOT,josephnoir/RIOT,kYc0o/RIOT,authmillenon/RIOT,miri64/RIOT,basilfx/RIOT,josephnoir/RIOT,smlng/RIOT,smlng/RIOT,kYc0o/RIOT,x3ro/RIOT,cladmi/RIOT,kaspar030/RIOT,smlng/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,OlegHahm/RIOT,jasonatran/RIOT,aeneby/RIOT,kYc0o/RIOT,ant9000/RIOT,miri64/RIOT,OTAkeys/RIOT,authmillenon/RIOT,toonst/RIOT,ant9000/RIOT,yogo1212/RIOT,cladmi/RIOT,RIOT-OS/RIOT,rfuentess/RIOT,rfuentess/RIOT,x3ro/RIOT,OTAkeys/RIOT,toonst/RIOT,toonst/RIOT,jasonatran/RIOT,cladmi/RIOT,josephnoir/RIOT,toonst/RIOT,miri64/RIOT,jasonatran/RIOT,mtausig/RIOT,OTAkeys/RIOT,ant9000/RIOT,yogo1212/RIOT,aeneby/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kYc0o/RIOT,aeneby/RIOT,josephnoir/RIOT,yogo1212/RIOT,smlng/RIOT,rfuentess/RIOT,mtausig/RIOT,OlegHahm/RIOT,authmillenon/RIOT,OlegHahm/RIOT,authmillenon/RIOT,smlng/RIOT,mtausig/RIOT,mtausig/RIOT,x3ro/RIOT,basilfx/RIOT,toonst/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,miri64/RIOT