Fix crash when unloading scene during tick of that scene

Source/Engine/Level/Level.cpp

@@ -958,9 +958,6 @@ bool LevelImpl::unloadScene(Scene* scene)
     // Simple enqueue scene root object to be deleted
     scene->DeleteObject();
 
-    // Force flush deleted objects so we actually delete unloaded scene objects (prevent from reloading their managed objects, etc.)
-    ObjectsRemovalService::Flush();
-
     return false;
 }