[x3d-public] repair X3D Examples Online validator links?

[John Carlson]

For example, 
https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Legacy/DiamondManLOA_1Index.html

Has a checkmark along the top that goes to the X3D Validator. 
Apparently, the url does not pass muster on the X3D Validator page, 
because it's not included in the URL text field, nor is the URL radio 
button clicked.

Also the JSON check doesn't seem to work either?

Likely there some security vulnerability with enabling these. It's not 
hard to copy/paste over the links to the validator page.

John