comctl32/listview: Use proper A/W call to measure item text string

[Nikolay Sivov]

  Spotted while testing for http://bugs.winehq.org/show_bug.cgi?id=24336

The problem is that we use GetTextExtentPoint32W for ansi strings too, 
with this patch notification depends on isW flag, created edit control 
depends on it and finally string length calculation depends too.

P.S. doesn't fix original bug though.
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