Register biomes before ores.

We may want to use biomes here at a later stage.

mods/default/mapgen.lua

@@ -1394,8 +1394,8 @@ if mg_params.mgname == "v6" then
 	default.register_mgv6_decorations()
 	minetest.register_on_generated(default.generate_nyancats)
 elseif mg_params.mgname ~= "singlenode" then
-	default.register_ores()
 	default.register_biomes()
+	default.register_ores()
 	default.register_decorations()
 	minetest.register_on_generated(default.generate_nyancats)
 end