fix: remove default setting on edge case where chat template overriden in dataset section

src/axolotl/utils/config/models/input/v0_4_1/__init__.py

@@ -800,20 +800,6 @@ class AxolotlInputConfig(
                 )
         return datasets
 
-    @model_validator(mode="before")
-    @classmethod
-    def set_default_chat_template(cls, data):
-        if data.get("chat_template") is None:
-            use_chat_template = any(
-                dataset["type"] == "chat_template"
-                for dataset in data.get("datasets", [])
-            )
-
-            if use_chat_template:
-                data["chat_template"] = ChatTemplate.tokenizer_default
-
-        return data
-
     @model_validator(mode="before")
     @classmethod
     def check_batch_size_fields(cls, data):