Repository: syncthing/syncthing (language: go)

Issue:
Remove more discontinued STUN servers
### Feature description

There's some more discontinued secondary STUN servers that are still in the list.

The discontinued ones I know of are:

- stun.callwithus.com:3478
- stun.ideasip.com:3478
- stun.voiparound.com:3478
- stun.sipgate.net:10000

### Problem or use case

Saving bandwidth, disk space and time

### Alternatives or workarounds

Leave them in there and let them get skipped


Discussion / hints:

Fix patch:
diff --git a/lib/config/config.go b/lib/config/config.go
index 935f66d3427..6805a15ebf2 100644
--- a/lib/config/config.go
+++ b/lib/config/config.go
@@ -75,19 +75,15 @@ var (
 		//"stun.syncthing.net:3478",
 	}
 	DefaultSecondaryStunServers = []string{
-		"stun.callwithus.com:3478",
 		"stun.counterpath.com:3478",
 		"stun.counterpath.net:3478",
 		"stun.ekiga.net:3478",
 		"stun.hitv.com:3478",
-		"stun.ideasip.com:3478",
 		"stun.internetcalls.com:3478",
 		"stun.miwifi.com:3478",
 		"stun.schlund.de:3478",
-		"stun.sipgate.net:10000",
 		"stun.sipgate.net:3478",
 		"stun.voip.aebc.com:3478",
-		"stun.voiparound.com:3478",
 		"stun.voipbuster.com:3478",
 		"stun.voipstunt.com:3478",
 		"stun.xten.com:3478",


Test patch: