Moves a currency type to or from the Unused currencies list.
"Unused" currencies behave no differently; the distinction only exists to allow players to hide currencies they don't care about from the main display.
See also Currency functions.
index- Index of a currency type or header in the currency list (between 1 and GetCurrencyListSize()) (
makeUnused- 1 to move this currency to the Unused category; 0 to return it to its original category (