Snow golems do not display their fire animation when they suffer burn damage

When a Snow Golem takes fire damage, its flame animation doesn't appear; it simply turns orange.

Steps to reproduce this issue:

1. Spawn a Snow Golem.

2. Cause it to take burn damage.

3. Observe its animation as it burns.

Expected results:

When the entity is set on fire, its flame animation should appear.

Observed results:

When the entity is burning, its flame animation doesn't appear; it simply turns orange.