1727775: android: ensure RFP covers desktop-site userAgent

edit: https://bugzilla.mozilla.org/show_bug.cgi?id=1727775 - from 3 years ago

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• HttpUserAgent
• NavigatorAppVersion,NavigatorBuildID, NavigatorOscpu, NavigatorPlatform, NavigatorUserAgent

When loading a website, the default is always desktop-site off. When flipping to desktop-site enabled, the header and navigator parts all change to match Linux

I want to make sure that this Linux version is the same for everyone. It doesn't have to be RFP's version (but seems to be: it matches expected), just as long as it's the same for everyone

cc @pierov find the code so we can check

edit: NFI why they have a NavigatorBuildID RFPTarget, since it's hardcoded 20181001000000 AFAIK for the last 6 years (unless it's to override prefs, but then why are they missing NavigatorAppName? - I thought the prefs were simply ignored in code)