COMDLG32: fix another regresion in 3.1-style file dialog from LB_DIR fix

[Alex Villací­s Lasso]

This patch fixes another regression caused by the fix to LB_DIR to 
return -1 when no files match the wildcard (validated by tests). The 
Wine 3.1-style file open/save dialogs assumed LB_ERR is a fatal error 
and stop. The patch removes this assumption.

This one should really fix bug #10809. :-)

Changelog:
* LB_DIR can legitimately return -1 when no files match the wildcard, so 
it is not an error. Do not treat it as such.

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

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