Disable locale-based font rules as a defense-in-depth

🔍 Bugzilla Audit

Review Mozilla 1795460: font visibility = 1: auto include preferred language from kLangPackFonts

• Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1795460
• Commit: fb1cfbfd

Description

Font and locale change upstream.

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