Fix spawn timer reset debug

mods/ENTITIES/mcl_mobs/spawning.lua

@@ -546,7 +546,7 @@ if mobs_spawn then
     minetest.register_globalstep(function(dtime)
         timer = timer + dtime
         if timer >= 15 then
-            timer = 15--0
+            timer = 0--15
             for _,player in ipairs(minetest.get_connected_players()) do
                 for i = 1,math.random(5) do