the 3D text extension have the same transparency problem of Sprite3D extension

the 3D text extension have the same problem that Sprite3D extension have, need attention.

_Originally posted by @Guilhermepr0jetos in https://github.com/GDevelopApp/GDevelop-extensions/issues/2150#issuecomment-5335631093_
            
<img width="1360" height="768" alt="image" src="https://user-images.githubusercontent.com/168924934/637886199-defea826-a127-43b1-8fb1-3d3150ebc68f.png" />
