kernel32: GetPrivateProfileString should set buffer to "" if default value is not set

[Christopher Smith]

This is a follow up to the previous patch which added the relevant check 
to our unit tests. GetPrivateProfileStrings should set lpReturnedString 
to "" if lpDefault isn't set and a key cannot be found. The existing 
code fails to set lpReturnedString[0] to NULL though it correctly 
returns 0. This patch corrects this behavior and removes the todo_wine 
from the relevant check in the unit tests.

--Chris
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