Cleanup the namespaces (#8132)

Content.Server/Radio/Components/HandheldRadioComponent.cs

@@ -1,6 +1,4 @@
-using System.Collections.Generic;
 using Content.Server.Chat;
-using Content.Server.Chat.Managers;
 using Content.Server.Radio.EntitySystems;
 using Content.Shared.Interaction;
 using Content.Shared.Popups;

Content.Server/Radio/Components/IListen.cs

@@ -1,5 +1,3 @@
-using Robust.Shared.GameObjects;
-
 namespace Content.Server.Radio.Components
 {
     /// <summary>

Content.Server/Radio/Components/IRadio.cs

@@ -1,6 +1,3 @@
-using Robust.Shared.GameObjects;
-using System.Collections.Generic;
-
 namespace Content.Server.Radio.Components
 {
     public interface IRadio : IComponent

Content.Server/Radio/EntitySystems/ListeningSystem.cs

@@ -1,6 +1,5 @@
 using Content.Server.Radio.Components;
 using JetBrains.Annotations;
-using Robust.Shared.GameObjects;
 
 namespace Content.Server.Radio.EntitySystems
 {