Fix: warmup_steps: 0 & warmup_ratio: 0 not disabling warmup (#3254)

* fix unintentional falsy checks

* chore: lint

---------

Co-authored-by: NanoCode012 <nano@axolotl.ai>

tests/e2e/integrations/test_liger.py

@@ -3,6 +3,7 @@ Simple end-to-end test for Liger integration
 """
 
 import pytest
+
 from axolotl.common.datasets import load_datasets
 from axolotl.train import train
 from axolotl.utils.config import normalize_config, prepare_plugins, validate_config