Don't spawn rad pulses on paused grids (#2121)

* Don't spawn rad pulses on paused grids

* Only radiate default grid

Co-authored-by: Metal Gear Sloth <metalgearsloth@gmail.com>

Content.Server/Interfaces/GameTicking/IGameTicker.cs

@@ -15,6 +15,16 @@ namespace Content.Server.Interfaces.GameTicking
     public interface IGameTicker
     {
         GameRunLevel RunLevel { get; }
+        
+        /// <summary>
+        ///     The map loaded by the GameTicker on round start.
+        /// </summary>
+        MapId DefaultMap { get; }
+        
+        /// <summary>
+        ///     The GridId loaded by the GameTicker on round start.
+        /// </summary>
+        GridId DefaultGridId { get; }
 
         event Action<GameRunLevelChangedEventArgs> OnRunLevelChanged;
         event Action<GameRuleAddedEventArgs> OnRuleAdded;