Update Cura desktop file with the right icon and version
Update Cura desktop file with the right icon and version

Contributes to Ultimaker/Uranium#42

totalretribution/Cura,ad1217/Cura,Curahelper/Cura,ynotstartups/Wanhao,fxtentacle/Cura,bq/Ultimaker-Cura,lo0ol/Ultimaker-Cura,fieldOfView/Cura,Curahelper/Cura,markwal/Cura,hmflash/Cura,totalretribution/Cura,senttech/Cura,fxtentacle/Cura,ynotstartups/Wanhao,ad1217/Cura,senttech/Cura,hmflash/Cura,bq/Ultimaker-Cura,DeskboxBrazil/Cura,markwal/Cura,fieldOfView/Cura,DeskboxBrazil/Cura,lo0ol/Ultimaker-Cura