fix(polkit): correct Linux biometric setup command in hint

[denniseijpe]

This is just a simple fix for the setup hint polkit prints.

setup-linux-biometrics doesn't exist on varlock-local-encrypt.

setup --linux-biometrics does.

[theoephraim]

Thanks! Will have this out in next release.

[pullfrog]

✅ No new issues found.

Reviewed changes Checked the Linux polkit setup guidance against the native helper's command parser, built-in help, main CLI hint, and user documentation.

• Corrected setup command Both stale references now use the supported varlock-local-encrypt setup --linux-biometrics syntax.

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