[tz] Moving more zones to 'backzone'

[Clive D.W. Feather]

> So why doesn't that argument apply to Europe/Glasgow and Europe/Cardiff?
>
> Followed in quick succession by Europe/Redruth.

Oops, should it be Europe/Caerdydd and Europe/Rhydruth?

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Clive D.W. Feather          | If you lie to the compiler,
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