Code cleanup: radio jammer (#29052)

* Code cleanup for radio jammer

* More Entity<T> for the people, and fix an accidental variable reuse

Content.Shared/DeviceNetwork/Components/DeviceNetworkJammerComponent.cs

@@ -1,3 +1,4 @@
+using Content.Shared.DeviceNetwork.Systems;
 using Robust.Shared.GameStates;
 
 namespace Content.Shared.DeviceNetwork.Components;
@@ -6,6 +7,7 @@ namespace Content.Shared.DeviceNetwork.Components;
 /// Allow entities to jam DeviceNetwork packets.
 /// </summary>
 [RegisterComponent, NetworkedComponent, AutoGenerateComponentState]
+[Access(typeof(SharedDeviceNetworkJammerSystem))]
 public sealed partial class DeviceNetworkJammerComponent : Component
 {
     /// <summary>