Update download_cc_textures.py

[martinarroyo]

The domain for CC0 Textures seems to have changed, which causes a 404 error when trying to download it. I tried simply to replace the domain string and it works fine, but maybe it also makes sense to update the name of the script.

[cla-bot[bot]]

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[themasterlink]

Hey,

we need your signed cla before merging this.

If you don't want to sign it, you can allow us to copy your code and create a new PR with it.

Best, Max

[themasterlink]

Thanks for your help this was fixed in #658