fix(config): remove discontinued primary STUN server (fixes #10008) (#10009)
The mechanism for primary STUN servers, is still intact, in case this
gets retried with a different domain.
### Purpose
As seen in [stun.syncthing.net doesn’t resolve
anymore](https://forum.syncthing.net/t/stun-syncthing-net-doesnt-resolve-anymore/24075/2?u=marbens)
on the forums, stun.syncthing.net has been shut down, so I think it's
probably a good idea to remove it.
### Testing
1. Have two or more devices
2. Disable Relaying
3. Have no Internet ports open on either end for incoming connections
trigger STUN)
4. Enable the `stun` debugging facility in the Actions -> Logs ->
Debugging Facilities
5. Verify that it doesn't output something like this within a few
seconds:
```
2025-03-30 05:51:32 Enabled debug data for "stun"
2025-03-30 05:51:47 Starting stun for Stun@udp://[::]:22000
2025-03-30 05:51:47 Running stun for Stun@udp://[::]:22000 via stun.syncthing.net:3478
2025-03-30 05:51:47 Stun@udp://[::]:22000 stun addr resolution on stun.syncthing.net:3478: lookup stun.syncthing.net: no such host
```
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Co-authored-by: Jakob Borg <[email protected]>
Marcus B Spencer