simplify load_model signature

scripts/finetune.py

@@ -252,14 +252,7 @@ def train(
 
     # Load the model and tokenizer
     LOG.info("loading model and peft_config...")
-    model, peft_config = load_model(
-        cfg.base_model,
-        cfg.base_model_config,
-        cfg.model_type,
-        tokenizer,
-        cfg,
-        adapter=cfg.adapter,
-    )
+    model, peft_config = load_model(cfg, tokenizer)
 
     if "merge_lora" in kwargs and cfg.adapter is not None:
         LOG.info("running merge of LoRA with base model")