Set the refresh of the player positions to 30sec

(60sec is a too high value for real time status)

mods/track_players/init.lua

@@ -1,4 +1,4 @@
-local time_interval = 60.0
+local time_interval = 30.0
 local fifo_path = "/home/quentinbd/minetest/worlds/minetestforfun/mt_players_fifo"
 
 function players_data()