[comctl32] Fix treeview with checkboxes creation

[Maxime Bellengé]

This patch fixes the creation of treeviews with checkboxes.
After some notes from Dmitry, I have slightly modified it and I think it
can be included in the cvs tree.

Max


Changelog:
   * Fix the creation of treeview with checkboxes

-- 
Maxime Bellengé <maxime.bellenge at laposte.net>
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