[Lazarus] Type used in function TListItem.GetState()

[Juha Manninen]

Partly related to issue
 https://bugs.freepascal.org/view.php?id=38565

I changed function TListItem.GetState to use enum TListItemState directly
instead of casting it to an integer.
It allows to remove many ugly typecasts.
I don't see any problems caused by it. None of the properties are
published, thus component streaming is not a problem.
However I don't know TListView very well, somebody may spot a potential
problem.
So, is it safe to apply? Please see the attached patch.

Juha
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