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Backport #20096 to Ruby 3.3 (ruby#9471)

Fix memory overread in registry.rb The terminator is not actually getting filled in; we're simply passing (two) bytes of empty memory as the NUL terminator. This can lead to garbage characters getting written to registry values. Fix this by explicitly putting a WCHAR_NUL character into the string to be sent to the registry API, like we do in the MULTI_SZ case. [Bug #20096]

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