Do not show macOS Privacy hint on network error pages
Follow-up from https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/43945
In order to minimize conflict with future iterations of Mozilla's patch (hinted by comments), rather than reverting the commit, I'd short-circuit [`RPMShowOSXLocalNetworkPermissionWarning()`](https://hg-edge.mozilla.org/mozilla-central/rev/bcc647e7dbfb#l1.31) to always return `false` (Tor Browser only).
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