Make Hounded ShouldUpgrade use TUNING values.

[O_Atoba_Azul]

Currently, the hounded component's chances for upgrading hounds into a Varglet is defined direct in the function, which means you have to overwrite the entire ShouldUpgrade function if you want to change the chances, which typically means, unless using UpvalueHacker, you have to overwrite the entire spawn data.

local _spawndata =
	{
		--...
  		ShouldUpgrade= function(amount, wave_pre_upgraded)
			if amount >= 8 then
				return math.random() < 0.7 --these values.
			elseif amount == 7 then
				return math.random() < 0.3
			elseif amount == 6 then
				return math.random() < 0.15
			elseif amount == 5 then
				return math.random() < 0.05
			end
			return false
		end,
	}