Omni's Custom Items 1.1.38 - Radiant Omen Voucher Render Fix

Fixed all four Radiant Omen voucher models rendering as invisible items.

Cause:
The supplied Blockbench JSONs combined custom element geometry with the
item/generated parent. Minecraft treats item/generated as a special flat-item
generator and, because the models had no layer0 texture, baked zero quads.

Fix:
The models now inherit from block/block and use front GUI lighting so Minecraft
bakes and displays their supplied 3D element geometry and textures.
