user32/spy: Use already retrieved window name and class name as WCHAR strings

[Nikolay Sivov]

While it seems it's ok to use these strings at this point, the question 
remains - when using CreateWindowA vs CreateWindowW does it really means 
window will be unicode or not and will IsWindowUnicode() give reliable 
output on such window.

This is spotted while running Monthcal tests that use CreateWindowA() 
and IsWindowUnicode returns 1 for it.
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