Fix the error causing the function to always return false.

Fix the error causing the function always returning false if player doesn't have access to all commands.
The key in the players table should be a number not a string, it caused the function to return false even if the group is in config.

Author: fnbar0

[core]/es_extended/server/functions.lua

@@ -612,7 +612,7 @@ end
 ---@param playerId string | number
 ---@return boolean
 function Core.IsPlayerAdmin(playerId)
-    playerId = tostring(playerId)
+    playerId = tonumber(playerId)
     if (IsPlayerAceAllowed(playerId, "command") or GetConvar("sv_lan", "") == "true") then
         return true
     end