[BUG] Wrong port value in sfserver alerts in discord

## User Story

As a `sfserver` user, I want `queryport` to be used in discord alerts.

## Basic info

* **Distro:** N/A
* **Game:** [Satisfactory]
* **Command:** [N/A]
* **LinuxGSM version:** [v21.5.0]

## Further Information

The [alerts on discord are printing `port`](https://github.com/GameServerManagers/LinuxGSM/blob/master/lgsm/functions/alert_discord.sh#L34), which for satisfactory is not the port a player should use in their game client (that one being `queryport`).

## Expected behaviour

With default `sfserver` config values, I should see `15777` instead of `7777` in the alert below: