Remove unused required argument on _startCamera and _stopCamera
Remove unused required argument on _startCamera and _stopCamera

(they were probably there due to a copy/paste error, see _setJobState)
CURA-2411

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