[GUI] Round globalViewPort width and height to be Integer
[GUI] Round globalViewPort width and height to be Integer

Related to discussed issue https://github.com/BabylonJS/Babylon.js/issues/11539
BabylonJS/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,sebavan/Babylon.js