Fix Flax `from_pt` (#1436)

Fix Flax `from_pt`.

It worked for models but not for pipelines.
Accidentally broken in #1107.

src/diffusers/modeling_flax_utils.py

@@ -332,7 +332,7 @@ class FlaxModelMixin:
             elif os.path.isfile(os.path.join(pretrained_path_with_subfolder, WEIGHTS_NAME)):
                 raise EnvironmentError(
                     f"{WEIGHTS_NAME} file found in directory {pretrained_path_with_subfolder}. Please load the model"
-                    " using  `from_pt=True`."
+                    " using `from_pt=True`."
                 )
             else:
                 raise EnvironmentError(

src/diffusers/pipeline_flax_utils.py

@@ -317,8 +317,8 @@ class FlaxDiffusionPipeline(ConfigMixin):
             allow_patterns = [os.path.join(k, "*") for k in folder_names]
             allow_patterns += [FLAX_WEIGHTS_NAME, SCHEDULER_CONFIG_NAME, CONFIG_NAME, cls.config_name]
 
-            # make sure we don't download PyTorch weights
-            ignore_patterns = "*.bin"
+            # make sure we don't download PyTorch weights, unless when using from_pt
+            ignore_patterns = "*.bin" if not from_pt else []
 
             if cls != FlaxDiffusionPipeline:
                 requested_pipeline_class = cls.__name__