Fix the mapgen not being set to singlenode

mods/skytest_initialize/init.lua

@@ -1,6 +1,7 @@
-mgparams = {mgname="singlenode"}
-minetest.register_on_mapgen_init(function(mgparams)
-	minetest.set_mapgen_params(mgparams)
+minetest.register_on_mapgen_init(function(params)
+	minetest.set_mapgen_params({
+		mgname = "singlenode",
+	})
 end)
 
 -- 2D noise for wave
@@ -116,4 +117,4 @@ minetest.register_on_generated(function(minp, maxp, seed)
 	vm:set_lighting({day=0, night=0})
 	vm:calc_lighting()
 	vm:write_to_map(data)
-end)
+end)