Obsolete Logger cleanup for EntitySystems (#25941)

* Small obsolete Logger cleanup

* Fixed three EntitySystem logs that weren't doing it right.

Content.Client/Light/RgbLightControllerSystem.cs

@@ -146,7 +146,7 @@ namespace Content.Client.Light
                 else
                 {
                     // admeme fuck-ups or bad yaml?
-                    Logger.Warning($"RGB light attempted to use invalid sprite index {index} on entity {ToPrettyString(uid)}");
+                    Log.Warning($"RGB light attempted to use invalid sprite index {index} on entity {ToPrettyString(uid)}");
                     rgb.Layers.Remove(index);
                 }
             }