Initialise distance2
Initialise distance2

It's always initialised by distanceFromPointToMesh, but from the scope of this function it's now also initialised.

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