fireflies - backport Use add_wear_by_uses to fix incorrect uses counts

* backporting d7dd15782c
  to fix https://github.com/minetest/minetest_game/pull/2959
  but will only work for recent engines.. 0.4.16/5.2.X will still
  suffers from such problem

mods/fireflies/init.lua

@@ -4,6 +4,8 @@
 local m_eth = minetest.get_modpath("ethereal")
 -- detecting cretive engine over creative privilegies
 local m_cre = minetest.get_modpath("creative")
+-- check recent engines
+local is_55 = has_feature("dynamic_add_media_table")
 
 -- firefly 
 minetest.register_node("fireflies:firefly", {
@@ -59,7 +61,7 @@ minetest.register_tool("fireflies:bug_net", {
 		end
 		if not m_cre then
 			if creative.is_enabled_for(player:get_player_name()) then
-				itemstack:add_wear(256)
+				if is_55 then itemstack:add_wear(256) else itemstack:add_wear_by_uses(256) end
 				return itemstack
 			end
 		end