Soul fire sets entities on normal fire

Standing on top of soul fire would set any mobs including players on normal fire.

See MC-170828 for the possible idea for a correction.

Steps to Reproduce:

1. Place soul soil.
2. Light the soul soil on soul fire using a flint and steel or fire charge.
3. Stand in the soul fire.

Observed Results:
The player is set on normal fire.

Expected Results:
The player should be set on soul fire.