tab.c: itemData not being used as ptr

[Thorsten Kani]

This Patch fixes a Crash in Explorer and allows it to correctly display 
the buttons on the Taskbar.

changelog:
TAB_DrawItemInterior should handle dis.itemdata as a pointer.

For a Reference please check:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/commctls/comboboxes/comboboxreference/comboboxstructures/drawitemstruct.asp

Thorsten
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