[TF2] Fix for collection checklists incorrectly marking some items as 'owned' #1496
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Resolves ValveSoftware/Source-1-Games#3522
Resolved issue where collections containing decorated weapons (skins from Gun Mettle, Tough Break) would report some items as 'owned' when player did not actually have them. This is a side effect from an additional check/pass used to support collections with War Paints.
Several decorated weapons from the Tough Break Update share the same paintkit index number, currently resulting in all instances of a skin (ie. Top Shelf, Boneyard) being marked as 'owned' if the player owned at least one of the items.

A check has been added to ensure that collections with decorated weapons do not go through the additional check needed for War Paint collections.
