[NUI] Allow to set Size.Depth (#3442)

[NUI] Allow to set Size.Depth (#3442)

Previous version set dali-side size first, and set Width/Height Specification.
But int Width/Height Specification setter, they also call Size2D property set.

Unfortunatly, Size2DProperty doesn't care about the depths of view.
So the Depth value is gone.

This patch re-ordering the function call to set dali-side size later
so Size.Depth will works well.

Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>
Co-authored-by: Eunki, Hong <eunkiki.hong@samsung.com>