Remove usages of AnchoredChangedMessage.

It was a component message which is now deprecated.

Content.Server/GameObjects/EntitySystems/ParticleAcceleratorPartSystem.cs

@@ -13,6 +13,22 @@ namespace Content.Server.GameObjects.EntitySystems
             base.Initialize();
 
             EntityManager.EventBus.SubscribeEvent<RotateEvent>(EventSource.Local, this, RotateEvent);
+            SubscribeLocalEvent<ParticleAcceleratorPartComponent, PhysicsBodyTypeChangedEvent>(BodyTypeChanged);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+
+            UnsubscribeLocalEvent<ParticleAcceleratorPartComponent, PhysicsBodyTypeChangedEvent>();
+        }
+
+        private static void BodyTypeChanged(
+            EntityUid uid,
+            ParticleAcceleratorPartComponent component,
+            PhysicsBodyTypeChangedEvent args)
+        {
+            component.OnAnchorChanged();
         }
 
         private static void RotateEvent(RotateEvent ev)