Revert "fixes a bunch of warnings"

This reverts commit d4d85b663f.

Content.Server/Atmos/EntitySystems/AirtightSystem.cs

@@ -14,6 +14,7 @@ namespace Content.Server.Atmos.EntitySystems
     {
         [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly AtmosphereSystem _atmosphereSystem = default!;
+        [Dependency] private readonly SpreaderSystem _spreaderSystem = default!;
 
         public override void Initialize()
         {