changed stitching poly decision
changed stitching poly decision

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