git: openjdk/jdk-sandbox: jep486: Remove windows-specific policy file as it is no longer needed.

[duke]

Changeset: 5d45bb1d
Branch: jep486
Author:    Sean Mullan <sean.mullan at oracle.com>
Date:      2024-10-14 08:37:11 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/5d45bb1d32513b3d47fa38f5037cb04921b4eb4f

Remove windows-specific policy file as it is no longer needed.

- src/java.base/windows/lib/security/default.policy