comctl32/tab: Fix DRAWITEMSTRUCT filling when extra item data of a custom size is used (try2)

[Nikolay Sivov]

  try2: more tests. Test with size < sizeof(LPARAM) shows that on item 
insertion at least sizeof(LPARAM) bytes are stored anyway. There's no 
way to get this data back with TCM_GETITEM, but WM_DRAWITEM notification 
uses at least sizeof(LPARAM) length.
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