Remove redundant #nullable enable (#4275)

Content.Server/Physics/Controllers/ConveyorController.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 using System.Collections.Generic;
 using Content.Server.Conveyor;

Content.Server/Physics/Controllers/MoverController.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System.Collections.Generic;
 using Content.Server.Inventory.Components;
 using Content.Server.Items;

Content.Server/Physics/Controllers/PullController.cs

@@ -1,5 +1,4 @@
-#nullable enable
-using System;
+using System;
 using System.Collections.Generic;
 using Content.Shared.Pulling;
 using Robust.Shared.GameObjects;

Content.Server/Physics/Controllers/SingularityController.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using Content.Server.Ghost.Components;
 using Content.Server.Singularity.Components;
 using Robust.Server.GameObjects;

Content.Server/Physics/TestbedCommand.cs

@@ -35,7 +35,6 @@ using Robust.Shared.Physics.Collision.Shapes;
 using Robust.Shared.Physics.Dynamics;
 using Robust.Shared.Timing;
 
-#nullable enable
 
 namespace Content.Server.Physics
 {