Fix end portal shrine being in lava in flat mapgen

mods/MAPGEN/mcl_strongholds/init.lua

@@ -19,6 +19,7 @@ local strongholds = {}
 local strongholds_inited = false
 
 local mg_name = minetest.get_mapgen_setting("mg_name")
+local superflat = mg_name == "flat" and minetest.get_mapgen_setting("mcl_superflat_classic") == "true"
 
 -- Determine the stronghold positions and store them into the strongholds table.
 -- The stronghold positions are based on the world seed.
@@ -45,7 +46,7 @@ local init_strongholds = function()
 		for a=1, ring.amount do
 			local dist = pr:next(ring.min, ring.max)
 			local y
-			if mg_name == "flat" then
+			if superflat then
 				y = mcl_vars.mg_bedrock_overworld_max + 3
 			else
 				y = pr:next(mcl_vars.mg_bedrock_overworld_max+1, mcl_vars.mg_overworld_min+48)