[Codemod][FbcodePyreModeHeaderRemoval] [batch:20/N] [shard:11/N] Remove Pyre mode headers

Summary:
X-link: meta-pytorch/botorch#3358

X-link: meta-pytorch/captum#1903

X-link: pytorch/ao#4781

Reviewed By: maggiemoss

Differential Revision: D116557922

Author: Pyre Bot Jr.

examples/source_separation/lightning_train.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-# pyre-strict
 from argparse import ArgumentParser
 from pathlib import Path
 from typing import Any, Callable, Dict, List, Mapping, Optional, Tuple, TypedDict, Union