Soul lantern animation not mapped in flipbook_textures.json

The soul lantern has a relevant 3 frame texture (like the normal lantern), but its animation definition is missing from the flipbook_textures.json file, so isn't being animated.

To verify:

1. Download and extract the template resource pack: https://aka.ms/resourcepacktemplate

2. Open textures/flipbook_textures.json in notepad

3. Search for "lantern"

4. Note the lack of a "soul_lantern" definition