Brewing stand fuel, bubbles and progress sprites do not support translucent textures

More loosely relates to these issues: MC-144009 MC-145821 MC-164001 MC-165403

The bug

If translucent pixels are present in any of the three UI sprites brewing stands use, they are rendered completely opaque in-game, which is not correct.

The bottle textures are baked into the UI for some reason rather than being separate sprites like all other outline-type textures (MC-74408), and as such are not included.

How to reproduce

1. Download and apply the attached resource pack
2. Start brewing
3. Observe

Expected results

Translucent textures where the fuel, arrow and bubbles would be.

Actual results

Entirely opaque.