Revert special casing display

We don't want this in general Hamilton.

hamilton/graph.py

@@ -10,8 +10,7 @@
 import inspect
 import logging
 import os.path
-
-# import pathlib
+import pathlib
 import uuid
 from enum import Enum
 from types import ModuleType
@@ -939,15 +938,13 @@ def display(
         # - `render()` accepts a `view` kwarg
         # - `render()` will append it's kwarg `format` to the filename
         if output_file_path:
-            with open(output_file_path + ".dot", "w") as f:
-                f.write(str(dot))
-            # if keep_dot:
-            #     kwargs["view"] = kwargs.get("view", False)
-            #     dot.render(output_file_path, **kwargs)
-            # else:
-            #     kwargs.pop("view", None)
-            #     output_file_path = f"{output_file_path}.{kwargs['format']}"
-            #     pathlib.Path(output_file_path).write_bytes(dot.pipe(**kwargs))
+            if keep_dot:
+                kwargs["view"] = kwargs.get("view", False)
+                dot.render(output_file_path, **kwargs)
+            else:
+                kwargs.pop("view", None)
+                output_file_path = f"{output_file_path}.{kwargs['format']}"
+                pathlib.Path(output_file_path).write_bytes(dot.pipe(**kwargs))
         return dot
 
     def get_impacted_nodes(self, var_changes: List[str]) -> Set[node.Node]: