fix: don't send polygons over command socket during planning phase (CURA-2789)
fix: don't send polygons over command socket during planning phase (CURA-2789)

The polygons of the prime tower were also sent on the wrong layer / height, causing it to be visualized within raft layers

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