Properly fix machinemanager access
Properly fix machinemanager access

Contributes to CURA-2006

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