fix: [stix1 import] Fixed distinction between atttribute values
fix: [stix1 import] Fixed distinction between atttribute values

- MISP attributes can be INT sometimes, so read the 2nd comment

- Previously an INT attribute value did not satisfy the condition,
  which made it considered as objects attributes and tried to
  create a MISP object instead of a single attribute

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