Obsolete Logger cleanup for EntitySystems (#25941)

* Small obsolete Logger cleanup

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

Content.Server/Explosion/EntitySystems/ExplosionSystem.cs

@@ -290,7 +290,7 @@ public sealed partial class ExplosionSystem : EntitySystem
 
         if (!_prototypeManager.TryIndex<ExplosionPrototype>(typeId, out var type))
         {
-            Logger.Error($"Attempted to spawn unknown explosion prototype: {type}");
+            Log.Error($"Attempted to spawn unknown explosion prototype: {type}");
             return;
         }