fix: [stix2 export] Fixed string truncation
fix: [stix2 export] Fixed string truncation

FloatingGhost/MISP,FloatingGhost/MISP,Rafiot/MISP,FIRSTdotorg/MISP,Rafiot/MISP,FloatingGhost/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FloatingGhost/MISP,devnull-/MISP,SteveClement/MISP,devnull-/MISP,FIRSTdotorg/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,devnull-/MISP,FIRSTdotorg/MISP,Rafiot/MISP,MISP/MISP,SteveClement/MISP,MISP/MISP,devnull-/MISP,Rafiot/MISP,MISP/MISP,MISP/MISP