Summary:
The icons used for the empty slots in the loom are not retextured in the Adventure Time, Star Wars, and Steven Universe resource packs.

Steps to Reproduce:

1. Open a world with the Adventure Time, Star Wars, or Steven Universe resource pack enabled
2. Place and open a loom
3. Look at the empty slot icons

Observed Results:
The slot icons use the default textures.

Expected Results:
The slot icons should be retextured, similarly to the slot icons in other GUIs.

Screenshots: