Updated Portal example to use layers (#4046)
Updated Portal example to use layers (#4046)

* Updated Portal example to use layers

* Update examples/src/examples/graphics/portal.tsx

Co-authored-by: Will Eastcott <37d41699bdee4fcb969ca499eb0f8b82c60d59cc@playcanvas.com>

* Update examples/src/examples/graphics/portal.tsx

Co-authored-by: Will Eastcott <37d41699bdee4fcb969ca499eb0f8b82c60d59cc@playcanvas.com>

Co-authored-by: Martin Valigursky <2113fa600d719248203230de1894fe2542067d96@snapchat.com>
Co-authored-by: Will Eastcott <37d41699bdee4fcb969ca499eb0f8b82c60d59cc@playcanvas.com>
MicroWorldwide/PlayCanvas,playcanvas/engine,playcanvas/engine,MicroWorldwide/PlayCanvas