Link to TUM FACADE dataset is invalid

[cosama]

Checklist

• [X] I have searched for similar issues.
• [X] I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for main branch).

Describe the issue

The link mentioned in https://github.com/isl-org/Open3D-ML/blob/main/ml3d/datasets/tumfacade.py for the processed data is invalid.

https://tumde-my.sharepoint.com/:f:/g/personal/olaf_wysocki_tum_de/EjA8B_KGDyFEulRzmq-CG1QBBL4dZ7z5PoHeI8zMD0JxIQ?e=9MrMcl.

With the link gone the TUM FACADE dataset can't really be used at all.

@ThomasFroech, can you update this please?