Apply suggestions from code review

Author: sayakpaul

tests/quantization/bnb/test_4bit.py

@@ -704,6 +704,7 @@ def test_lora_loading(self):
 
 
 @require_transformers_version_greater("4.44.0")
+@require_peft_backend
 class SlowBnb4BitFluxControlWithLoraTests(Base4bitTests):
     def setUp(self) -> None:
         gc.collect()