Fix ground plane rendering by updating near_world convention in material

[ssheorey]

Type

• Bug fix (non-breaking change which fixes an issue): Fixes #
• New feature (non-breaking change which adds functionality). Resolves #
• Breaking change (fix or feature that would cause existing functionality to not work as expected) Resolves #

Motivation and Context

The ground plane is not visible after updating Filament from v1.9.9 to v1.54.

Checklist:

• I have run python util/check_style.py --apply to apply Open3D code style
  to my code.
• This PR changes Open3D behavior or adds new functionality.
  • Both C++ (Doxygen) and Python (Sphinx / Google style) documentation is
    updated accordingly.
  • I have added or updated C++ and / or Python unit tests OR included test
    results (e.g. screenshots or numbers) here.
• I will follow up and update the code if CI fails.
• For fork PRs, I have selected Allow edits from maintainers.

Description

         // getWorldFromClipMatrix() expects z in "inverted DX" convention
         // (Filament >= v1.10): near = 1.0, far = 0.0 in [0,1].
         // Using z=1.0 gives the near-plane world position for this pixel
         // direction, which is the ray origin for ground-plane intersection.
         // (In Filament v1.9.9 the matrix used GL-standard z where z=0.0
         // approximated the near plane; that no longer holds after the
         // VERTEX_DOMAIN_DEVICE z-conversion was introduced.)

[update-docs]

Thanks for submitting this pull request! The maintainers of this repository would appreciate if you could update the CHANGELOG.md based on your changes.