[BUG] World generation type is clamped after UI selection, rather than beforehand

[Beethoven-n]

I thought I might try to generate a single-biome world, but found that when I selected the Single Biome worldgen type, it didn't generate the biome I requested of it. I went to recreate the world, and found it using a locked Custom world type.

The best solution for this would probably be to gray out the World Type button (but I hope you do, in the future, allow other world types.)

[SoLegendary]

For the time being the best I can do is to grey out the option. Allowing for other types at this time is rather difficult (mostly due to my inexperience with using datapacks to control world generation)