[Bug]: ut99 default installation is not able to register on master servers and does not work as a result

### User story

As a user who is willing to setup Unreal Tournament server for multiple people I would like to have it working.

### Game

Unreal Tournament

### Linux distro

Ubuntu 24.04

### Command

command: start

### Further information

Apparently, the current (2025-08-30) default setup of Unreal Tournament game server (utserver), does not have the proper list of master servers. So the game server can not initialize.

As far as I understand, this file (or its parts, "ServerActors"): https://github.com/GameServerManagers/Game-Server-Configs/blob/main/ut99/Default.ini should be used. However, I was not able to find how to properly adjust the existing configs. Could you please help with finding out what I am missing?

### Relevant log output

```shell
[2025.08.30-09.44.54:316][302]LogHTTP:Warning: Retry 2 on https://ut-public-service-prod10.ol.epicgames.com/ut/api/cloudstorage/system
[2025.08.30-09.44.54:316][302]LogHTTP:Warning: Retry 2 on https://ut-public-service-prod10.ol.epicgames.com/ut/api/matchmaking/session
[2025.08.30-09.44.54:349][304]LogHTTP:Warning: 0x736366867d80: request failed, libcurl error: 6 (Couldn't resolve host name)
[2025.08.30-09.44.54:349][304]LogHTTP:Warning: 0x73634fa12f80: request failed, libcurl error: 6 (Couldn't resolve host name)
[2025.08.30-09.44.54:367][305]LogHTTP:Warning: Lockout of 5.000000s on https://ut-public-service-prod10.ol.epicgames.com/ut/api/cloudstorage/system
[2025.08.30-09.44.54:367][305]LogHTTP:Warning: Lockout of 5.000000s on https://ut-public-service-prod10.ol.epicgames.com/ut/api/matchmaking/session

[2025.08.30-09.45.19:477][797]LogHTTP:Warning: Retry exhausted on https://ut-public-service-prod10.ol.epicgames.com/ut/api/cloudstorage/system
[2025.08.30-09.45.19:477][797]LogOnline:Warning: MCP: Invalid response. CorrId=UE4-0218AA722F080B1E002C01B639C3DA18 code=0 errorcode=ConnectionFailure errormessage=Connection to the server failed. errorraw=ConnectionFailure
[2025.08.30-09.45.19:477][797]LogOnline:Warning: MCP: EnumerateFiles request failed. Connection to the server failed.
[2025.08.30-09.45.19:477][797]LogHTTP:Warning: Retry exhausted on https://ut-public-service-prod10.ol.epicgames.com/ut/api/matchmaking/session
[2025.08.30-09.45.19:477][797]LogOnline:Warning: MCP: CreateSession request failed. Invalid response. CorrId=UE4-05EFF76D31080B1E002C00AA39DE4BA8 code=0 errorcode=ConnectionFailure errormessage=Connection to the server failed. errorraw=ConnectionFailure
[2025.08.30-09.45.19:527][800]LogOnline:Warning: Async task 'FOnlineAsyncTaskMcpCreateSession bWasSuccessful: 0 Session: Game' failed in 30.756137 seconds
```

### Steps to reproduce

1. Install `utserver` following instructions on https://linuxgsm.com/servers/utserver/
2. Start it with `./utserver start` command.