USER32: fix CB_GETLBTEXT and CB_GETLBTEXTLEN ANSI-Unicode calls

[Krzysztof Foltman]

ChangeLog:
* CB_GETLBTEXT and CB_GETLBTEXTLEN: Return values CB_ERR and CB_ERRSPACE
are not translated.
* CB_GETLBTEXT doesn't translate string to caller's buffer when CB_ERR
is returned.

-- 
Krzysztof

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