Fix typo: Rename Untextered train into Untextured

Been discussed extensively, but let's vote on it anyway.

There is typo in one of the traits of our seafood. There is an "Untextered" trait which should've been "Untextured", but the artist did the typo filling the metadata. He's for fixing it and renaming it back to "Untextured". Rarity.tools also asked us to fix it, so we're inclined to do it.

Here is a discussion issue, if you're against – leave a comment why. https://github.com/lobster-dao/overview/issues/43

No traits would be removed.