fix: [stix import] Fixed default event & attribute distribution values
fix: [stix import] Fixed default event & attribute distribution values

MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,Rafiot/MISP,FIRSTdotorg/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FloatingGhost/MISP,Rafiot/MISP,FloatingGhost/MISP,SteveClement/MISP,SteveClement/MISP,FloatingGhost/MISP,MISP/MISP,FIRSTdotorg/MISP,MISP/MISP,Rafiot/MISP,FIRSTdotorg/MISP,Rafiot/MISP,MISP/MISP