advapi32: make sure delete_key recursively deletes keys

[James Hawkins]

Hi,

On at least XP/2000 RegDeleteKey can no longer accept a NULL lpSubKey
parameter to indicate that the key represented by hKey should be
deleted.  An empty string should be used instead.  This will make
delete_key work on all windows instead of just 9x.

Changelog
* pass an empty string instead of NULL to RegDeleteKey to delete hKey

-- 
James Hawkins
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