Fix crash on rendered frame copy used by SceneView recorder

[aleyooop]

In current implementation SurfaceCopier makes copy using SceneLifecycleObserver.onFrame(), which is wrong and causing instant crash.

Considering Filament documentation copyFrame() should be called after a frame is rendered using render but before endFrame is called.

[grassydragon]

Hi! Thank you for the pull request! We'll take this into consideration after the big changes for the version 1.0.0 are merged by Thomas.