Fix Reduced Effect of Curses on Self not clamping (#1220)

Copy from PathOfBuildingCommunity/PathOfBuilding#8783

Co-authored-by: LocalIdentity <localidentity2@gmail.com>

Author: LocalIdentity

src/Modules/CalcDefence.lua

@@ -1862,7 +1862,7 @@ function calcs.defence(env, actor)
 	if breakdown then
 		breakdown.LightRadiusMod = breakdown.mod(modDB, nil, "LightRadius")
 	end
-	output.CurseEffectOnSelf = modDB:More(nil, "CurseEffectOnSelf") * (100 + modDB:Sum("INC", nil, "CurseEffectOnSelf"))
+	output.CurseEffectOnSelf = m_max(modDB:More(nil, "CurseEffectOnSelf") * (100 + modDB:Sum("INC", nil, "CurseEffectOnSelf")), 0)
 	output.ExposureEffectOnSelf = modDB:More(nil, "ExposureEffectOnSelf") * (100 + modDB:Sum("INC", nil, "ExposureEffectOnSelf"))
 	output.WitherEffectOnSelf = modDB:More(nil, "WitherEffectOnSelf") * (100 + modDB:Sum("INC", nil, "WitherEffectOnSelf"))
 

src/Modules/CalcPerform.lua

@@ -2499,7 +2499,7 @@ function calcs.perform(env, skipEHP)
 						local cfg = { skillName = grantedEffect.name }
 						local inc = modDB:Sum("INC", cfg, "CurseEffectOnSelf") + gemModList:Sum("INC", nil, "CurseEffectAgainstPlayer")
 						local more = modDB:More(cfg, "CurseEffectOnSelf") * gemModList:More(nil, "CurseEffectAgainstPlayer")
-						modDB:ScaleAddList(curseModList, (1 + inc / 100) * more)
+						modDB:ScaleAddList(curseModList, m_max((1 + inc / 100) * more, 0))
 					end
 				elseif not enemyDB:Flag(nil, "Hexproof") or modDB:Flag(nil, "CursesIgnoreHexproof") then
 					local curse = {