Fix copyright line format

Removes a double comment indicator from a copyright line. This can
break scripts that parse files to extract copyright and license
information.

Bug: None
Change-Id: I891d865020b64a4ae3dbe9dee369471e3d0368bf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2516206
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
diff --git a/infra/gn_isolate_map.pyl b/infra/gn_isolate_map.pyl
index 1d46784..325f25e 100644
--- a/infra/gn_isolate_map.pyl
+++ b/infra/gn_isolate_map.pyl
@@ -1,4 +1,4 @@
-## Copyright 2020 The ANGLE Project Authors. All rights reserved.
+# Copyright 2020 The ANGLE Project Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.