fix: perform z hop always when not combing (CURA-1506)
fix: perform z hop always when not combing (CURA-1506)

whether to perform a z hop only when the comb move would collide only influences when the combing calculation decides to fail

alephobjects/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,totalretribution/CuraEngine,Ultimaker/CuraEngine,alephobjects/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine