Don't produce mipmapped versions of atlases that don't use mipmaps

[muzikbike]

Request Description

Mipmapped versions of several atlases are generated, however there is no evidence that these are used by the game anywhere for any of the atlases besides the blocks atlas. Generating these wastes VRAM and costs extra time when loading resources.

Affected atlases: armor trims, banner patterns, beds, chests, decorated pots, shield patterns, shulker boxes, signs

I'm 99% sure this is only the case since several of these were part of the main atlas in 1.15's development but were later split in the first prerelease, and Mojang didn't notice that these were redundantly generated.

If these are indeed used by the game I haven't knowingly seen the effects, since applying noisy textures to these objects and viewing them en masse from a distance and sharp angle causes all the grainy Moire patterns that mipmaps are designed to eliminate.