Revert "Correct retraction speed"
Revert "Correct retraction speed"

This reverts commit 36eb3471df3c4545ef75fe77d10218280cf0b241.

Contributes to issue CURA-2795.

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