Allow user to override either English, or localized, skinned file.

Original LLDir::findSkinnedFilenames() implementation used a tricky rule: a
given skin directory was only considered if it provided a default-language
override for the sought filename, regardless of whether it also provided
localizations for that filename. Discussion with Richard clarifies that we
want to allow the user to override neither, either or both. Change
findSkinnedFilenames() accordingly; update unit tests to verify new semantics.

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