Soul campfires emit a light level of 15

Summary:
Soul campfires emit a light level of 15, which is inconsistent with soul torches/lanterns and Java Edition.

Steps to Reproduce:

1. Place a soul campfire at night
2. Place a soul torch/lantern 25 blocks away from the campfire
3. Notice the difference in light levels

Observed Results:
Soul campfires emit a light level of 15.

Expected Results:
Soul campfires should emit a light level of 10, just like soul torches/lanterns.