save_roundtrip: the lit campfire keeps cooking while Horizon runs

Campfires now tick, so the fixture's campfire advances its CookingTimes
between load and save, as the lit furnace does.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/test_save_roundtrip_parity.py

@@ -80,6 +80,8 @@ IGNORED = {
     # chunk generation first), so counters and positions of live things move on.
     r'^chunk\.block_entities\.\(2, -60, 5\)\.(cooking_time_spent|lit_time_remaining|Items\[\]\.count)$':
         'the lit furnace keeps smelting',
+    r'^chunk\.block_entities\.\(14, -60, 5\)\.CookingTimes$':
+        'the lit campfire keeps cooking',
     r'^chunk\.block_entities\..*\.(ticks_since_song_started|Age|BrewTime|warning_level|ticks_in_hive|last_vibration_frequency|listener\..*|RecipesUsed\..*|'
     r'server_data\.state_updating_resumes_at)$':
         'block entity timers advance',