[whatwg] Charset override table should match case of IANA registry

[Ian Hickson]

On Thu, 18 Jun 2009, Geoffrey Sneddon wrote:
>
> Although charsets are case insensitive, it'd probably be best to be 
> consistent with the IANA registry. The only change this means makes is 
> changing "Windows-*" to "windows-*".

Fixed.

-- 
Ian Hickson               U+1047E                )\._.,--....,'``.    fL
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