Remove unnecessary shebang line
This removes an unnecessary shebang line from `fake_filesystem_shutil.py`, as
this file is a Python module and isn't invoked via CLI.
diff --git a/pyfakefs/fake_filesystem_shutil.py b/pyfakefs/fake_filesystem_shutil.py
index d01d367..ce22b21 100755
--- a/pyfakefs/fake_filesystem_shutil.py
+++ b/pyfakefs/fake_filesystem_shutil.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-#
# Copyright 2009 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");