fix transition on Enter VR button causing icon to shrinks as it disappears on iOS (fixes #1229)
fix transition on Enter VR button causing icon to shrinks as it disappears on iOS (fixes #1229)

darkwing/aframe,jaxmolina/ar,googlecreativelab/aframe,wizgrav/aframe,ngokevin/aframe,mkungla/aframe,fernandojsg/aframe,aframevr/aframe,wizgrav/aframe,msimpson/aframe,weddingdj/aframe,darkwing/aframe,chenzlabs/aframe,mkungla/aframe,jaxmolina/ar,jzitelli/aframe,RSpace/aframe,jzitelli/aframe,RSpace/aframe,chenzlabs/aframe,googlecreativelab/aframe,ngokevin/aframe,dmarcos/aframe,weddingdj/aframe,aframevr/aframe,MatthewShotton/aframe,msimpson/aframe,MatthewShotton/aframe,fernandojsg/aframe,dmarcos/aframe