Fix dry_grass_N on dirt producing dirt_with_grass

`dry_grass_N` has groups `grass` and `dry_grass`, so if the check for `grass` is done first, having dry_grass on it makes it turn into `dirt_with_grass` instead of `dirt_with_dry_grass`. Changing the order fixes this.

mods/default/functions.lua

@@ -645,10 +645,11 @@ minetest.register_abm({
 		-- Snow check is cheapest, so comes first
 		if name == "default:snow" then
 			minetest.set_node(pos, {name = "default:dirt_with_snow"})
-		elseif minetest.get_item_group(name, "grass") ~= 0 then
-			minetest.set_node(pos, {name = "default:dirt_with_grass"})
+		-- The group grass is also present in dry grass, so check dry grass first
 		elseif minetest.get_item_group(name, "dry_grass") ~= 0 then
 			minetest.set_node(pos, {name = "default:dirt_with_dry_grass"})
+		elseif minetest.get_item_group(name, "grass") ~= 0 then
+			minetest.set_node(pos, {name = "default:dirt_with_grass"})
 		end
 	end
 })