Acid Hunter should fully refund on kill

Or else, compensate Urgot's mana regeneration.

When mana pots where removed, everybody looked to mages, but no attention was paid to the red headed step children of league : mana based caster ADs. I am currently down to running mana crystal and teleport to be able to quickly get tear and alleviate the suffering.

I understand not wanting to let him poke endlessly from second one, but this change would at least allow him to farm without having to spend the first few minutes of the game passively wait to be able to go back to fountain. This is especially obnoxious in a world where manaless champions with ranged harass exist. There are solutions to his lane bullying other than cutting his supply of oxygen, like the one i've seen proposed a few times of having his lock on range scale with Noxian Corrosive Charge's level.