Some tweaks

I deleted some unnecessary lines of code, made clouds more sparse in
the desert and made “cactus” spawn in the desert.

Currently there is a small bug where the clouds will blink on the far
right column when they are generated. I am still trying to find the
cause of that problem.

I am thinking about making transitions to and from oceans and mountain
biomes so that it is smoother and if I get the time I can make boats
generate in the ocean.