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.