Fix tincture quality rounding issue (#8874)

src/Modules/CalcPerform.lua

@@ -1558,7 +1558,9 @@ function calcs.perform(env, skipEHP)
 			if item.rarity == "MAGIC" then
 				tinctureEffectInc = tinctureEffectInc + effectIncMagic
 			end
-			local effectMod = (1 + (tinctureEffectInc) / 100) * (1 + (item.quality or 0) / 100)
+			-- Compute tincture effect multiplier.
+			-- Tincture effect multiplier is rounded to 2 decimal places before applying it.
+			local effectMod = math.floor((1 + (tinctureEffectInc) / 100) * (1 + (item.quality or 0) / 100) * 100) / 100 
 
 			-- same deal as flasks, go look at the comment there
 			if buffModList[1] then