Fix tooltip

Author: bitbeans

SimpleDnsCrypt/Models/AvailableResolver.cs

@@ -17,7 +17,7 @@ public class AvailableResolver : PropertyChangedBase
 		private List<int> _ports;
 
 		[JsonIgnore]
-		public string ToolTip => $"empty";
+		public string ToolTip => $"Ports: {string.Join(",", _ports.ToArray())}";
 
 		[JsonIgnore]
 		public bool IsInServerList