Update deprecated settings syntax

mods/ENTITIES/mcl_item_entity/init.lua

@@ -295,7 +295,7 @@ end
 
 --modify builtin:item
 
-local time_to_live = tonumber(core.setting_get("item_entity_ttl"))
+local time_to_live = tonumber(minetest.settings:get("item_entity_ttl"))
 if not time_to_live then
 	time_to_live = 300
 end

mods/ENTITIES/mobs_mc/0_gameconfig.lua

@@ -287,7 +287,7 @@ mobs_mc.spawn = {
 -- This table contains important spawn height references for the mob spawn height.
 -- Please base your mob spawn height on these numbers to keep things clean.
 mobs_mc.spawn_height = {
-	water = tonumber(minetest.setting_get("water_level")) or 0, -- Water level in the Overworld
+	water = tonumber(minetest.settings:get("water_level")) or 0, -- Water level in the Overworld
 
 	-- Overworld boundaries (inclusive)
 	overworld_min = -2999,

mods/ENTITIES/mobs_mc_gameconfig/init.lua

@@ -216,7 +216,7 @@ mobs_mc.override.spawn = {
 
 -- This table contains important spawn height references for the mob spawn height.
 mobs_mc.override.spawn_height = {
-	water = tonumber(minetest.setting_get("water_level")) or 0, -- Water level in the Overworld
+	water = tonumber(minetest.settings:get("water_level")) or 0, -- Water level in the Overworld
 
 	-- Overworld boundaries (inclusive)
 	overworld_min = mcl_vars.mg_overworld_min,