Changed items search in chargiveitem command

Unique ID searches can't use nut.utilStringMatches as it gets the first item that has the searched text in its uniqueID.

It causes problems if you define items that has similar uniqueIDs, for example, let's suppose you have 2 items, one with an uniqueID of "item_a" and another with "item_a_a", in the previous version of the chargiveitem command you would get "item_a" if you type "item_a_a" and that's not the item you wanted, so performing normal string comparison would fix the problem.