Errata - Update class method convention to use `cls` (#8574)

* Class methods are supposed to use `cls` conventionally

* `make style && make quality`

* An Empty commit

---------
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

examples/community/lpw_stable_diffusion_xl.py

@@ -2165,7 +2165,7 @@ class SDXLLongPromptWeightingPipeline(
 
     @classmethod
     def save_lora_weights(
-        self,
+        cls,
         save_directory: Union[str, os.PathLike],
         unet_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
         text_encoder_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
@@ -2188,7 +2188,7 @@ class SDXLLongPromptWeightingPipeline(
             state_dict.update(pack_weights(text_encoder_lora_layers, "text_encoder"))
             state_dict.update(pack_weights(text_encoder_2_lora_layers, "text_encoder_2"))
 
-        self.write_lora_layers(
+        cls.write_lora_layers(
             state_dict=state_dict,
             save_directory=save_directory,
             is_main_process=is_main_process,

examples/community/pipeline_demofusion_sdxl.py

@@ -1339,7 +1339,7 @@ class DemoFusionSDXLPipeline(
 
     @classmethod
     def save_lora_weights(
-        self,
+        cls,
         save_directory: Union[str, os.PathLike],
         unet_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
         text_encoder_lora_layers: Dict[str, Union[torch.nn.Module, torch.Tensor]] = None,
@@ -1368,7 +1368,7 @@ class DemoFusionSDXLPipeline(
             state_dict.update(pack_weights(text_encoder_lora_layers, "text_encoder"))
             state_dict.update(pack_weights(text_encoder_2_lora_layers, "text_encoder_2"))
 
-        self.write_lora_layers(
+        cls.write_lora_layers(
             state_dict=state_dict,
             save_directory=save_directory,
             is_main_process=is_main_process,