[libc++][NFC] Use consistent layout for license in Python files

Most Python files were using `# === [...]` instead of `#=== [...]`
so I went with what was the most common in the codebase.
diff --git a/libcxx/utils/adb_run.py b/libcxx/utils/adb_run.py
index dc15b51..cddbd19 100755
--- a/libcxx/utils/adb_run.py
+++ b/libcxx/utils/adb_run.py
@@ -1,11 +1,11 @@
 #!/usr/bin/env python3
-#===----------------------------------------------------------------------===##
+# ===----------------------------------------------------------------------===##
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
-#===----------------------------------------------------------------------===##
+# ===----------------------------------------------------------------------===##
 
 """adb_run.py is a utility for running a libc++ test program via adb.
 """