fix: [stix2 export] Exporting only TLP tags as MarkingDefinition
fix: [stix2 export] Exporting only TLP tags as MarkingDefinition

- The other tags are (as before a recent change)
  exported as labels

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