Cloned lights name assignment correction
Cloned lights name assignment correction

See https://forum.babylonjs.com/t/cloned-light-doesnt-receive-its-assigned-name/25668
RaananW/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js