Fixed the error of losing the [Copy] item when selling a tower.

Fixed an issue where the [Copy] skill would not be used on Statue, Scroll, Key items.

Skill adjustment [Copy - Wave 20]: Success rate is 100% for tier 2 items, 60% for tier 3 items, 25% for ancient/rebirth/unique items, 50% for broken items. (Cooldown: 80s) [Only succeeds once for ancient/rebirth/unique items]

Fixed Avatar of Warden not increasing race rate.

Fixed Val'kyr's reward system.