fix: [stix2 export] Removed some useless processing
fix: [stix2 export] Removed some useless processing

MISP/MISP,SteveClement/MISP,FIRSTdotorg/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,FIRSTdotorg/MISP,SteveClement/MISP,MISP/MISP,FIRSTdotorg/MISP,MISP/MISP,FIRSTdotorg/MISP,SteveClement/MISP,MISP/MISP