Don't predict body init (#12163)

* Don't predict body init

Client doesn't handle predicted entity spawning so the organs hang around.

* Just use init

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Shared/Body/Systems/SharedBodySystem.cs

@@ -7,7 +7,7 @@ namespace Content.Shared.Body.Systems;
 
 public abstract partial class SharedBodySystem : EntitySystem
 {
-    private const string BodyContainerId = "BodyContainer";
+    protected const string BodyContainerId = "BodyContainer";
 
     [Dependency] protected readonly IPrototypeManager Prototypes = default!;