Blood-Red Magboots now correctly show if magboots are active (#38013)

* Change JetPack Item Visuals to use GenericVisualizer instead of AppearanceChangeEvents

* Fix YAML indentation for jetpacks.yml

Content.Shared/Movement/Systems/SharedJetpackSystem.cs

@@ -202,4 +202,5 @@ public abstract class SharedJetpackSystem : EntitySystem
 public enum JetpackVisuals : byte
 {
     Enabled,
+    Layer
 }