Remove unused variable
Remove unused variable

This was changed earlier that it doesn't return the same mock every time but creates a new mock in findContainer. So the single mock that used to be returned every time is no longer needed.

Contributes to issue CURA-3497.

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