Setting `general.useragent.override` does not spoof the platform part anymore in ESR 60 which is confusing

Despite updating general.useragent.override to match ESR 60 (done according to comment:16:ticket:25543) the platform part is not spoofed to Windows on my Linux box.

Now, that is intentional, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1404608.

So, we probably should not set general.useragent.override at all anymore and just rely on the settings we get with privacy.resistFingerprinting? Because if we explicitly set it to the Windows UA but then don't get that, this is weird.

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