Only remove the old convex hull shadow when a tool is really being used. Contributes to CURA-1504
Only remove the old convex hull shadow when a tool is really being used.
Contributes to CURA-1504

Curahelper/Cura,hmflash/Cura,senttech/Cura,ynotstartups/Wanhao,hmflash/Cura,fieldOfView/Cura,totalretribution/Cura,ynotstartups/Wanhao,Curahelper/Cura,totalretribution/Cura,senttech/Cura,fieldOfView/Cura