kernel32/tests: GetPrivateProfileString tests should check if buffer terminates with null

[Christopher Smith]

Our current tests for GetPrivateProfileString don't currently check to 
make sure that our outbuffer is properly null terminated (and as it 
turns out, in some cases it is not). The following patch adds a test for 
that. It's "todo_wine"'d until my follow up patch is sent which fixes 
the bug triggered by this change

--Chris
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