User32: Fix SytemParametersInfoW to create registry keys properly

[Kimmo Myllyvirta]

This fixes cases when HKCU\Software\Wine does not exist when 
SytemParametersInfoW is called - in this case it created HKCU\Software 
registry key as volatile key, thus preventing applications to create any 
non-volatile keys under HKCU\Software and potentially preventing 
applications to work properly.

Changelog:
If HKCU\Software\Wine does not yet exist, create it as non-volatile key, 
instead of volatile.
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