Add item_name support for hudbars mod

Does the same thing as 8bb1c8288b

item_names.lua

@@ -6,12 +6,15 @@ local dtimes = {}
 local dlimit = 3  -- HUD element will be hidden after this many seconds
 local air_hud_mod = minetest.get_modpath("4air")
 local hud_mod = minetest.get_modpath("hud")
+local hudbars_mod = minetest.get_modpath("hudbars")
 
 local function set_hud(player)
 	local player_name = player:get_player_name() 
 	local off = {x=0, y=-70}
 	if air_hud_mod or hud_mod then
 		off.y = off.y - 20
+	elseif hudbars_mod then
+		off.y = off.y + 13
 	end
 	huds[player_name] = player:hud_add({
 		hud_elem_type = "text",