Animation navbar is updated correctly when a new model is loaded
Animation navbar is updated correctly when a new model is loaded

Fixing https://github.com/BabylonJS/Babylon.js/issues/4441

jbousquie/Babylon.js,sebavan/Babylon.js,sebavan/Babylon.js,jbousquie/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,RaananW/Babylon.js,jbousquie/Babylon.js,NicolasBuecher/Babylon.js,BabylonJS/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,NicolasBuecher/Babylon.js,NicolasBuecher/Babylon.js,BabylonJS/Babylon.js,Kesshi/Babylon.js,Kesshi/Babylon.js,sebavan/Babylon.js