reward can use same batch check

src/axolotl/prompt_strategies/bradley_terry/chat_template.py

@@ -21,9 +21,6 @@ class BTChatTemplateStrategy(ChatTemplateStrategy):
     Bradley-Terry reward model pairwise chat template prompt strategy.
     """
 
-    def is_prompt_batched(self, prompt: dict[str, Any]) -> bool:
-        return all(isinstance(v, list) for v in prompt.values())
-
     def _tokenize_single_prompt(self, prompt):
         """