Undo a temporary hack-fix

[dshadowwolf]

Now that a more permanent fix is in place in the right spot, the temporary hack of having NetherMetals generate entries for Vanilla Materials that might be missing can go away.

Now Vanilla Materials will always be in the MMDMaterials registry.

[CLAassistant]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
2 out of 3 committers have signed the CLA.

✅ dshadowwolf
✅ jriwanek
❌ knoxhack
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[dshadowwolf]

bah, something went wrong and the merge is pointing to the wrong branch