Remove some warnings (#5391)

* Remove unused Dependency fields

* Remove noop null check

Content.Server/Pointing/EntitySystems/PointingSystem.cs

@@ -32,7 +32,6 @@ namespace Content.Server.Pointing.EntitySystems
         [Dependency] private readonly IPlayerManager _playerManager = default!;
         [Dependency] private readonly ITileDefinitionManager _tileDefinitionManager = default!;
         [Dependency] private readonly IGameTiming _gameTiming = default!;
-        [Dependency] private readonly ActionBlockerSystem _actionBlockerSystem = default!;
         [Dependency] private readonly RotateToFaceSystem _rotateToFaceSystem = default!;
 
         private static readonly TimeSpan PointDelay = TimeSpan.FromSeconds(0.5f);