vscode: don't fixup on darwin
Editing the `code` binary within the app bundle causes the bundle's signature to be invalidated, which prevents launching starting with macOS Ventura, because VS Code is notarized.
See https://eclecticlight.co/2022/06/17/app-security-changes-coming-in-ventura/ for more information.
(cherry picked from commit b29b81e458554168c45ad02a399b4d6f53a79f24)