comctl32: toolbar: make sure all TBUTTON_INFO fields are initialized when a button is added in the middle

[Mikołaj Zalewski]

  I forgot that Alloc/ReAlloc takes care of freeing the memory and, 
thus, the only case where there is a problem is TB_INSERTBUTTON when 
inserting a button in the middle (and this is were I've seen a crash). 
As other fields are also not initialized in this case (instead we use 
the values of the button that used to be in this place), I have added a 
ZeroMemory.

Mikolaj
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