Remove redundant #nullable enable (#4275)

Content.Server/Singularity/Components/ContainmentFieldComponent.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using Robust.Shared.GameObjects;
 using Robust.Shared.Physics.Collision;
 using Robust.Shared.Physics.Dynamics;

Content.Server/Singularity/Components/ContainmentFieldGeneratorComponent.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;

Content.Server/Singularity/Components/EmitterComponent.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 using System.Threading;
 using System.Threading.Tasks;
@@ -24,7 +23,6 @@ using Robust.Shared.Utility;
 using Robust.Shared.ViewVariables;
 using Timer = Robust.Shared.Timing.Timer;
 
-#nullable enable
 
 namespace Content.Server.Singularity.Components
 {

Content.Server/Singularity/Components/RadiationCollectorComponent.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 using Content.Server.Power.Components;
 using Content.Shared.Interaction;

Content.Server/Singularity/Components/ServerSingularityComponent.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using Content.Shared.Singularity;
 using Content.Shared.Singularity.Components;
 using Robust.Shared.Audio;