chore: add FIXME for remote deref (#14116)

lib/browser/objects-registry.js

@@ -87,6 +87,7 @@ class ObjectsRegistry {
 
   // Private: Dereference the object from store.
   dereference (id) {
+    // FIXME(MarshallOfSound): We should remove this once remote deref works well
     if (process.env.ELECTRON_DISABLE_REMOTE_DEREFERENCING) return
 
     let pointer = this.storage[id]