fix: don't insert stnadby cooling if heating is at the start of the layer plan (CURA-3537)
fix: don't insert stnadby cooling if heating is at the start of the layer plan (CURA-3537)

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