fix method name

Author: linoytsaban

src/diffusers/loaders/lora_pipeline.py

@@ -4250,7 +4250,7 @@ def lora_state_dict(
         return state_dict
 
     @classmethod
-    def maybe_expand_t2v_lora_for_i2v(
+    def _maybe_expand_t2v_lora_for_i2v(
         cls,
         transformer: torch.nn.Module,
         state_dict,