USER32: Patch 1 of 6: Fix returned value of LB_DIR

[Alex Villacís Lasso]

Tests reveal that (on an unsorted listbox), LB_DIR returns the value of the
highest index inserted, as if it had sorted the list of files before starting
the insertion. This patch attempts to replicate this behavior.

Changelog:
* Make LB_DIR return an index value as if it had inserted filenames in sorted
  order.
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