USER32: fix regression in DlgDirList caused by modified LB_DIR return behavior, with tests

[Alex Villací­s Lasso]

Recent fixes to LB_DIR behavior for returned value caused a regression 
in the DlgDirList[A|W] function. The fix for LB_DIR aimed to comply to 
the documented and tested behavior that it should return the last 
inserted index. Since the listbox indexes are 0-based, this implies that 
in the case that LB_DIR inserts nothing, it should return -1. 
Unfortunately, DlgDirList[A|W] took this -1 as a fatal error and stops 
filling entries, causing the regression. This patch fixes the regression 
and adds tests showing that the LB_DIR behavior is actually correct, and 
also tests DlgDirList for the fixed behavior.

Fixes bug 10809.

Changelog:
* DlgDirList should not stop filling listbox if one category does not 
return any files in LB_DIR
* Tests showing that LB_DIR behavior is already correct for wildcard 
that does not match any files.
* Tests showing DlgDirList behavior for wildcard that does not match any 
files, including fixed behavior

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

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