USER32: fix LB_ITEMFROMPOINT tests for listbox control

[Alex Villací­s Lasso]

This test depends on particular items of the listbox display being 
displayed at particular pixel positions. These assumptions may fail for 
different font sizes. The (unexpected) caption that appears on WinXP 
also causes trouble. Furthermore, the test wants to check behavior of a 
partially-visible item, but the listbox uses a height which is an 
integer multiple of the item vertical size, unless LB_NOINTEGRALHEIGHT 
is specified. The patch attached fixes four test failures on WinXP (and 
possibly also on Win98).

Changelog:
* Fix failing test in WinXP-SP2 by resizing control and using WS_POPUP and
  LBS_NOINTEGRALHEIGHT to enforce assertions used inside the test.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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