Fix griddrag and tethergun (#10510)

Content.Shared/Weapons/Ranged/Systems/SharedTetherGunSystem.cs

@@ -5,7 +5,16 @@ namespace Content.Shared.Weapons.Ranged.Systems;
 
 public abstract class SharedTetherGunSystem : EntitySystem
 {
-    protected const string CommandName = "tethergun";
+    public const string CommandName = "tethergun";
+}
+
+/// <summary>
+/// Sent from server to client if tether gun is toggled on.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class TetherGunToggleMessage : EntityEventArgs
+{
+    public bool Enabled;
 }
 
 [Serializable, NetSerializable]